This has been disabled during early debugging phase and apparently I
just forgot to re-enable it.

Morale: don't use `:` to disable stuff; use `#` (ideally at column 0),
which stands out much more.

In some cases the file is not slurped so declaring encoding at the tail
is useless.

Overview of changes:

 *  Revamped version directive format

    This is a backwards-incompatible change, but is an exception because
    (well, we're in 0.x.y phase and) it's only used in manpage
    generator, so at worst people will lose the version info from
    manpage footer.  Also it hasn't been around for a long.

 *  Moved most sfdoc code to separate module

    Yet another module has been born.  This enables better design, reuse
    and also easier testing.

 *  mkusage will not force empty line before indent mode (-i)

    This way it's much more useful; one can produce much more concise
    listings (*and* have them indented, *and* read them from array).

 *  Added -o|--only option to sfdoc for single-directory sets

 *  sfdoc will now correctly report module version (not Shellfu version)

 *  sfpath now supports -V, short version of --version-semver

 *  sfpath now makes sure to sort items consistently under C locale

 *  Added __usage sub-command to shellfu()

 *  Moved perl dependency correctly to shellfu-bash-inigrep

 *  Fixed bad shebang line (thx lintian)

 *  Solved or muted last ShellCheck issues

 *  Revised coding style an docstrings

 *  Codebase maintenance

Useful when working with a private set of modules; to see what's inside,
etc.

Allow for re-use and more independent testing.

This was not intended,  only indentation was intended (no pun indented).

Seriously, omitting the newline makes the -i mode more useful as we can
now use syntax like:

    mkusage "topic" \
      --
      "topics:" \
      "${topics[@]}"

That is much less code, especially if the list we wanted to include is
already in array.

Use CamelCase for inheritable variable names, avoid re-hashing each
module twice and add function and variable docstrings, remove unnecessary
whitespace

...or '(no version)', if version is not present.

This also changes format; the 'K: V' format is problematic as it makes
it hard to separate from other directives.  'K=V' is now the only
accepted format.

Note that essential functions should be as fast as possible so they
probably should not inspect their arguments.

Overview of changes:

 *  Added proper obsolete declarations

Tested on Fedora, praying for it to work on Debian.

Overview of changes:

 *  Added missing dependencies

 *  Removed unnecessary dependency

 *  Codebase maintenance

Overview of changes:

 *  Override SHELLFU_INCLUDE in test runs

    Otherwise modules are actually loaded from system, if they are
    installed.

 *  SHELLFU_PATH now has preference over SHELLFU_INCLUDE

    This should have been all along; SHELLFU_PATH would not be able to
    force a particular module version in cases like testing.

 *  Added shellfu() docstring

 *  Minor co

 *  Improved and updated test header

Should have been for a long time now.

Otherwise we're not really testing "this" shellfu but the installed one.

This should have been all along; if SHELLFU_PATH is not preferred,
one cannot override it eg. in test runs.

Overview of changes:

 *  Re-packaged with better granularity

    Having multi-module packages such as 'shellfu-core' limits dependency
    control on user part.  Additionally, after splitting packages
    to one-per-module, we could move some of modules to 'sh' space,
    ie. increase their usability.

 *  Removed old 'sync' module

    Having one "wait" function does not really justify its presence in
    the main shellfu repo; if anyone needs it anyway, I can provide it
    as a separate package.

 *  Renamed binaries shellfu-doc and shellfu-get to sfpath and sfdoc

    Both were kind of hard to type.  "shellfu-get" was a bit too generic
    given that it really only prints path.  Also 'sfdoc' resembles other
    doc viewers such as 'perldoc' and 'pydoc'.

 *  Moved sfdoc to main package

    sfdoc can be useful everywhere Shellfu style is used; not just in
    Shellfu modules.

 *  Moved packages to /usr space

    Eventually, if packages should reach distributions, they should be
    there anyway.  Also it makes it easier to use Shellfu in
    environments where /usr/local/bin might be missing on PATH (eg. cron
    on debian).

 *  Improved and cleaned up lot of meta-data

    From SPEC file to debian directory to mkit.ini, there have been many
    changes in meta-data.

 *  Excluded shellfu_import test from Debian build time

    This test cannot succeed because it relies on shell features ouside
    POSIX that Debian's minimalistic dash does not implement.  The test
    will have to be rewritten; the issue is tracked here:

        https://github.com/AloisMahdal/shellfu/issues/1

 *  Added 'version' sub-command to shellfu()

    Now shellfu() function can report version of a Shellfu module.
    Versioning is not mandatory but can be useful for module unit tests
    to provide more rich reports.  (E.g. TF_HEADER in external module
    shellfu-bash-saturnin makes use of this)

 *  Refactored shellfu() a bit

 *  Made sfpath respect SHELLFU_DIR from environment

 *  Added warning in sfdoc if pod2man is missing

 *  Changed license to LGPLv2

 *  Fixed pretty.debug() bug that would hide caller name

 *  Fixed test bug with debug -v and Bash 4.4+

 *  Refactored tests a bit

 *  Added build-time tests

 *  Codebase maintenance

Add missing perl and ps dependencies and remove bash (because Essential
packages are not supposed to be there).

https://github.com/AloisMahdal/shellfu/issues/1

Bash 4.4 and later does not quote array declaration when `declare -p` is
used.

In the rare case when pod2man is not available, the usage options are
limited (one can still view pages in other modes or list functions
etc.).