Overview of changes:

 *  Heavily simplify template maintenance
 *  Update MKit to version v0.0.9
 *  Update MKit packaging meta-data
 *  Add packaging for demo kit
 *  Fix and improve demo kit
 *  Lot of refactoring
 *  Improve docs

Useful for testing saturnin itself

Use of app name when naming of global variables and/or mkit tokens makes
upgrade of the saturnin template painful and error-prone, while none of
these variables can be overriden from environment so the namespacing
advantage is vain.

Since saturnin's dedication to be "meta-command" builder, the distinction
between "meta" and something else does not make much sense.

The routines are all basically related to the meta-command functions.

New command allows to define flexible menus in INI files.

Single INI root now contains all menu definitons.  Each menu consists of
item generator, selector and consumer, which are checked and chained
together.

Alternatively to specifying a generator, items can be listed right in
the INI section.

This module is intended to be moved around with saturnin, but unlike
main meta-command (bin/saturnin.skel), it should not be necessary to
rename it or edit to adapt to new project.

Conventional ip wrapper -- not desktop-related.

A debugging utility -- not desktop-related.

Conventional curl wrapper -- not desktop-related.

Conventional rsync wrapper -- not desktop-related.

Conventional virsh wrapper -- not desktop-related.

An improved version of previous code