Renaming exception to not contain exception in the name
Removing Testrepo implemention
Adding NoOp composer which only returns raw_data
Removing unneeded test composer
Removing the testsource and DateSource
Replace double with call to #create_source
Replacing another call double call with #create_source
Removing unneeded TestComposer
Echo composer now can echo to a file
Echo composer not returns data it echoed
Echo composer now favours composite data over raw data when both is
passed in
Removing code that dealt with naming Orchestras.
This was mainly for tests, but now is not needed any more because
Orchestras get their name from const assignment
Removing test code that didnt make an assertion