fixed compiler warning and sd ecmd commands
Merge pull request #362 from dwiesner/sd_ecmd_fix

fixed compiler warning and sd ecmd commands
Make itoa_fixpoint save: add buffer lenght param
Add string parsing for fixpoint int16 and int16
change max_len of string to size of output buffer
add function description to header
reindent
Merge branch 'util_fixpoint_stringparse' into bsbport_mqtt

Conflicts:
	core/util/fixedpoint.h
	core/util/string_parsing.c
	core/util/string_parsing.h
WIP: bsbport optimize ram usage