Bugfix: Add missing newline to libusb_init failure message
Bugfix: Allow starting non-libusb devices if libusb_init fails

libusb_init fails on systems without (hardware) USB support
Merge commit '1a4cfde' into bfgminer

Conflicts:
	miner.c
Bugfix: serial_autodetect_ftdi: Debuglog FTDI COM port mappings returned, fix type of FT_HANDLE
Merge commit 'c6fb74e' into bfgminer
Bugfix: logging: Since we are inlining snprintf, stdio.h is needed
Merge commit 'bef0581' into bfgminer