Move mce ini files to inifiles/ subdirectory
Remove explicit handling of mce-radio-states.ini file

Since content from all of the mce ini-files is combined, we do not
need to read radio states data separately.
Remove support for explicitly named mce ini-files

Since the whole mce code base is now using the combined ini-file
data, we can
a) remove unused functions mce_conf_read_conf_file() and
   mce_conf_free_conf_file()
b) omit passing of NULL keyfileptr to the rest of mce_conf_xxx()
Merge pull request #39 from spiiroin/radiostates_ini

Radiostates configuration cleanup