* Add flight level field to PIREP field closes#401
* Default value for distance 0 closes#400
* Block airline deletion if assets exist #367
* Formatting
* Move some of the base exception classes
* Fix skin references to use settings table
* Set default for theme name if setting is wrong
Previously you were not able to edit an airline & it would return an error when adding one cause the redirect route wasnt set properly. this is fixed now