deleted showAvailableSessions
fixed branch merging issues
changed export method
fixed indentation issues
Merge branch 'barcode-import' into csv-export

Conflicts:
	HelperFunctions.py
	csv.py
Implemented student data export to CSV file
Removed unused code from exportSudent()
Implemented course date export to file
Added test data to the schema file
Fixed a bug in schema file
Merge branch 'csv-export' into dev

Conflicts:
	HelperFunctions.py