INIFILE C functions

| is_defined_section | bdefinds       | Have any keys been parsed in the specified section?       |
| is_defined_key     | bdefindp       | Has the specified group/key combination been parsed?      |
| ini_read_file      | ireadi         | Read and parse groups/keys/values from specified INI file |
| ini_reset          | ireseti        | forget all group/key/value data                           |
| inilvok            | lvop           | Value string of specified group/key                       |
| iniwfs             | wfsoi          | First section name of INI properties                      |
| iniwns             | wnsoi          | Next section name of INI properties                       |
| iniwfnos           | wfkos          | First key name in specified section                       |
| iniwnnos           | wnkos          | Next key in previously previously specified section       |
| do_parse_property  | parse_property | (priv)                                          |
| do_parse_section   | parse_section  | (priv)                                          |