Add submodule for X6000_ztex_comm4 (aka x6500-overclocker-0402)
ztex: Use standard file header/comment formatting, and update license to GPLv3

Also removes copyright entirely from libztex.h which contains no copyrightable information.
Add submodule for ZtexBTCMiner (aka ztex_ufm1_*)
Merge branch 'bitstream_src' into bfgminer