Since it's normal e.g. for a dependency to import the same module as
upstream, the warning only created unnecessary noise.

As a followup to last revamp:

 *  Use more extensible test definition format,
 *  separate testing framework from setup script and split to includes,
 *  update test scripts as well as data,
 *  consolidate test output,
 *  and make some small improvements/fixes on the way.

 *  Enable running all tests via make,
 *  simplify tests (lay off data/tmpdir manipulation to framework),
 *  set rules for naming, exit statuses, etc,
 *  remove beakerlib dependency.

Use the meta-library and handle that oputside __echo (i.e. do not try to
import it kajillion times).

Purpose of this library is to import the actual pretty-printing library
based on FFOO_MKPRETTY value or fall back to mkpretty_plain.

A library can now have init function to allow for more dynamic behavior.
The function's name must be __ffoo_NAME__init, where NAME is the library
name.

Note that the init exit status is used as exit status of the `ffoo
import NAME` call (or `ffoo try_import NAME`) and overrides exit
status of the sourcing (which must always be zero anyway).

try_import does not aim to import anything, whereas this function's aim
is to import stuff.

Code include expansion overwrote result of variable name expansion.

(This had no effect so far since there are no variables in markdown
files.)

Move expansions to functions and comment them properly there.

Die by default but allow "just try"

 *  Split into functions as appropriate;
 *  add docstrings;
 *  reduce redundancy;
 *  run everything in C locale (=> update oracles),
 *  add subtest boundaries to output.