lua : add a dumper documentation generator

This dumper will dump the API in a format that is loadable as a
lua module.
lua : add a tool to compare two API dumps
lua : remove versionning in content.lua
lua : make documentation deterministic again
Remove an unneeded include

... that was confusing me
pwstorage: allow libsecret along gkeyring and kwallet
make ...pixels iops congruent in behavior
Merge pull request #701 from josepvm/master

Fixed some fuzzy translations in Catalan translation
Update French translation.
Updated Catalan translation