[DOC] document get_single_addr & string2mask

Signed-off-by: etienne <etienne.basset@ensta.org>
[DOC] document char2int

Signed-off-by: etienne <etienne.basset@ensta.org>
[DOC] documents a few functions

Signed-off-by: etienne <etienne.basset@ensta.org>
[BUG] st_sscanf could find the conversion specifier after expr if there was a field length

Signed-off-by: etienne <etienne.basset@ensta.org>
[MINOR] make space range handle hyphen '-', must be the last char of the range

Signed-off-by: etienne <etienne.basset@ensta.org>
[FEATURE] %s ends on SPACE
add a new type %[ (sequence of chars)

Signed-off-by: etienne <etienne.basset@ensta.org>
[HELPER] add helper fill_char_range

Signed-off-by: etienne <etienne.basset@ensta.org>
[TYPO] mach_char_... ==>match_char...

Signed-off-by: etienne <etienne.basset@ensta.org>