Change Track fixtures to match new database structure in preparation for #24
Add Key fixtures from live database
Initial implementation of #24 - all systems show in View page
Fix issue with errors being generated when no Key set for Track
Change validation to accept only Key.id values generated by select box
New empty test file for Key
Improve validation feedback
Convert Key textfield to select box
View: fix another missing index error
Add: send Key data to view
Change bpm_start rules to allowEmpty as non-selection prevents saving
Change Key text input to select box
Row now clones without including previous row's data or ID; completes #24
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