SSM: Silence JSON parse error message for HTTP attempts
util: utf8_len and utf8_strlen functions to quickly measure a character or string
Consistently allocate space used for formatting numbers

Conflicts:
	miner.c
Bugfix: Use UTF-8 for micro prefix internally (and in logging)

Conflicts:
	miner.c
Merge branch 'stratumsrv' into bfgminer-3.10.x