#25 Saving Form or setting Input file resets File entries

[Anna Wojtowicz]

In the MOOSE Launcher, if you either set the input file to something else, or save the form, the selections in the additional File entries (mesh, power history, etc.) will reset back to the first item in the list of allowed values.

[Anna Wojtowicz]

This was due to the the file importing not being able to add new values to the list of allowed values. Changed the behaviour of Entry.setValue() to handle File Entries the same as the Undefined Entries, which doesn't require checking the list of allowed values.