Fix tests and a docstring

Fix /source/ tests for status_display by checking for csv response
Remove unnecessary comments
Use assertTrue from the test class in api tests
Fix inforecords tests

Correct the code style to be more PEP8
Remove comments
Rename plates -> detectors
Disable test tot check if script exists, the script is in script dir,
not where the config expects it to be, which is correct for Nagios
server.