iniparser.c:
- strsplit() returns size of result array
- iniparser_getstring_array() returns size of result array
- iniparser_getint_array() returns size of result array
- added iniparser_getdouble_array()

iniparser.h:
- iniparser_getstring_array() returns size of result array
- iniparser_getint_array() returns size of result array
- added iniparser_getdouble_array()

test/:
- added files parse_array.c and twisted-arrays.ini for testing the new
array features