Add submodule for X6000_ztex_comm4 (aka x6500-overclocker-0402)
Add submodule for ZtexBTCMiner (aka ztex_ufm1_*)
bitforce: Allow a longer timeout (1250ms) for ZCX (Device Information) commands

Conflicts:
	driver-bitforce.c
ztex: Use standard file header/comment formatting, and update license to GPLv3

Also removes copyright entirely from libztex.h which contains no copyrightable information.
Merge branch 'bitstream_src' into bfgminer-3.0.x