Remove unecessary directory traversal in LoadLog. Refs #3043

It happened only when the glob failed but if the glob fails that should
suffice enough to say there is nothing there.
ISISDataArchive uses HTTP status code for errors. Refs #6309
Allow custom dialogs to turn off automatic property parsing on init.

Refs #6309.  This prevents multiple setting of properties which can be
problematic for properties that take some time when setting values
i.e. file searching.
Prevent LoadDialog from searching again when run is clicked...

Refs #6309. The dialog now uses the full string as found by the widget rather
than the box text to prevent another search when run is clicked and the
property is reset.