Added underflow checks in some libconfig functions
Changed short lookup functions to int16
Changed uint lookup functions to uint32
Changed config_lookup_string_char to config_lookup_mutable_char
Changed config_setting_lookup_string_char to config_setting_lookup_mutable_string so the name of the function is clearer
Changed config parameter net-submask to netmask
Changed many function link types to static linking
Added check for 'disabled' special value in md5 configuration
Corrected INSERT INTO query in make_new_char_sql
Corrected typecast issues
Removed several unused variables