optionFileLoad - Load the locatable config files, in order

       This  function  looks in all the specified directories for a configuration file ("rc" file or "ini" file)
       and processes any found twice.  The first time through, they are processed in reverse  order  (last  file
       first).   At  that  time,  only "immediate action" configurables are processed.  For example, if the last
       named file specifies not processing any more configuration files, then no more configuration  files  will
       be processed.  Such an option in the first named directory will have no effect.

       Once  the  immediate  action configurables have been handled, then the directories are handled in normal,
       forward order.  In that way, later config files can override the settings of earlier config files.

       See the AutoOpts documentation for a thorough discussion of the config file format.

       Configuration files not found or not decipherable are simply ignored.

       opts   program options descriptor

       prog   program name

       Returns the value, "-1" if the program options descriptor is out of date or  indecipherable.   Otherwise,
       the value "0" will always be returned.

       optionFileLoad - Load the locatable config files, in order

       0 -> SUCCESS, -1 -> FAILURE

       The info documentation for the -lopts library.
       ao_string_tokenize(3),   configFileLoad(3),  optionFindNextValue(3),  optionFindValue(3),  optionFree(3),
       optionGetValue(3),  optionLoadLine(3),   optionMemberList(3),   optionNextValue(3),   optionOnlyUsage(3),
       optionPrintVersion(3),      optionPrintVersionAndReturn(3),      optionProcess(3),      optionRestore(3),
       optionSaveFile(3),    optionSaveState(3),    optionUnloadNested(3),    optionVersion(3),    strequate(3),
       streqvcmp(3), streqvmap(3), strneqvcmp(3), strtransform(3),

                                                   2018-08-26                                  optionFileLoad(3)

       #include <your-opts.h>
       cc [...] -o outfile infile.c -lopts [...]

       int optionFileLoad(tOptions * opts, char const * prog);