clarify comment
[tests] First unit test framework

Following Nemo testing guidelines because this project might be
included in nemomobile.
Using QTestLib because it's there and many other nemo packages use it.
[spec] Add URL to project repo
code cleanup: get rid of a duplicate prototype
[tests] Make tst_fat require only fat.cpp
[tests] Add a simple test
[tests] Also track test coverage
[tests] extend the empty_fat test
[tests] Add test for entries past end of fat
[tests] Make fat_init reusable
[tests] Add more tests for fat.cpp
[tests] Add a helper for checking data fills
[tests] 100% coverage of fat.cpp
[dir] Return an error for invalid directory index
[tests] Started tests for dir.cpp
refactoring tests: use helper macro for checking array values
[tests] Make dir_init reusable
[tests] Test for directory entry creation
[tests] Add subdir test and some stub tests
refactoring: split filemap.cpp out from vfat.cpp