In spite of there being considerable documentation sometimes in the
config file, we go with CC0 because we don't want the notion of
'derived work' of a config file.
The example `settings.conf` is also CC0. Add some docs to
it while we're at it.
- a handful of modules had an unused *requires* key in module.desc;
this is probably from previous intentions around
prerequisites-testing. Since the settings were empty anyway,
they have been removed.
- [unpackfs] Compacted the way *requiredModules* list is written
- Strings like "{} the {} with {}" are terrible for translators:
- no context
- no possibility to re-order grammatical units
- substituting in English parts-of-speech is going to make a mess
- Write the strings out with explicitly named substitutions,
no part-of-speech substitution, and better formatting.
- Make *mandatory* optional (and default to false); this
allows shorter lists of entries
- Allow degenerate entries which are just a name
(which have *mandatory* set to false as well).
SEE #992
- With refactored code, introducing new kinds of actions
is very few lines of code. Allow disabling targets
(services was already possible). Allow masking units,
but as a special case require the complete name.
FIXES#975
- The three steps of modifying services in the target
system do basically the same thing, so factor out
the loops and logging into a systemctl() function.
- Log to warning() instead of just debugging, on failure.
