Add accelerators to more stuff in the find/replace dialog
Fix trimming of second line in Recombine Lines
Fix some edge-cases in the thesarus code

Handle missing parts-of-speach and trailing pipes on lines.
Select the contents of the Find Next box when the dialog is first created

It was only being selected when the dialog already existed and was just
being re-shown.
Always search all lines if only one line is selected

I.e. ignore the "In Selection" option for find (but not Replace All) if
the selection is probably not meaningful.