New version
    
    - Do not use the 'btrfs' plugin in overrides tests (vpodzime)
    - Do not use the btrfs plugin in library tests (vpodzime)
    - Check for btrfs module availability in btrfs module (vtrefny)
    - Move kernel modules (un)loading and checking into utils (vtrefny)
    - Free locale struct in kbd plugin (vtrefny)
    - Add test for setting partition flags on GPT (vtrefny)
    - Use only sgdisk to set flags on GPT (vtrefny)
    - Move the fs.h file to its original place (vpodzime)
    - Add a HACKING.rst file (vpodzime)
    - Mark bcache tests as unstable (vpodzime)
    - Fix memory leaks in bd_fs_vfat_get_info() (vpodzime)
    - Revert the behaviour of bd_fs_check_deps() (vpodzime)
    - Split the bd_fs_is_tech_avail() implementation (vpodzime)
    - Split the FS plugin source into multiple files (vpodzime)
    - Fix bd_s390_dasd_format (vponcova)
    - Mark unstable tests as such (vpodzime)
    - bd_s390_dasd_is_ldl should be true only for LDL DADSs (vponcova)
    - Do not lie about tag creation (vpodzime)