Made comment box on accept and reject dialogs bigger, multiline and
centered.
Corrected layout problem with comment box in reject source dialog.
Moved comment box to the more general SourceValidationDialog.
Added manual inspection option for reject source dialog.
Pressing enter now submits the source validation form instead of 
adding a newline character.  Also gave the comment text box a fixed size
that seems reasonable.
Merge pull request #48 from drusk/comment_box

Comment box