[TYPO3-mvc] Let's have some more domain models + data mappers

[Oliver Klee]

Dear all,

my oelib extension currently already has quite a few domain models +
data mappers. I'd like to port them (and their functions) to extbase,
including the unit tests:

- BE user
- BE usergroup
- country
- FE user
- FE usergroup
- language


Should I just go ahead, or is there anything special which I need to know?


Oli