Resilience around tickit.ini and freqit.ini file open operations.
Throw exceptions rather than just loggin an "Unable to open" error
(easier tracking fo the soruce of the error). Log the description and
errno value associated with the file open failure.
Create the .ini files if they don't already exist (rather than crashing
out with an error).
Replace the deprecated 'e' file open mode flag with 'x'.
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