Tweaked the handler for PIVT_PLAY to play the currently loaded file without a filename specified
Neatened up the options struct to be more readable
Added an extra command (g) to list available files and lengths
Further work on file listing command. Also fixes for an audio bug that caused crashes
Fixed a few glitches with building on a Pi, and improved the instructions.
Added a volume selection command line flag
Some usability improvements to making sure files exist
Merge pull request #2 from samdnic/master

File listing command