Updated FileFinderWizard.java: updated a UI component; renamed the
button Stop to Abort and subsequently changed it's label text from
"Stop" to "Abort".
Updated FileFinderApplication.java: implemented UI behavior for the
Abort button; index task is cancelled, status label icons are updated,
and indexed flag is unflagged (set to false). Also updated UI behavior
for the browse button; selecting a different working folder resets the
idnexed flag to unflagged (false).