General:
* Moved pypo author info into one file
* Added two database columns in schedule table: "schedule_group_played"
and "media_item_played".
API clients:
* Created get_liquidsoap_data() function which allows you
to give arbitrary data to liquidsoap.
* Added documentation
* Renamed functions to make it more obvious what is happening
pypo_cli:
* Got rid of more constants that were not needed
* Created function set_export_source() to reduce code repetition
* Separated the downloading of the schedule from tracking what has
been played. The tracking info is now kept in a separate file.
This fixes the major bug that the playlist keeps restarting for
the first minute of playback.
* converted more print statements to debug statements
pypoTester:
* Now uses samples from the audio_samples directory, and schedules two
audio clips back-to-back.
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