Adjusted add/remove text, added popup when item removed from list

 - confirmation text after adding/removing remains longer now
 
 - there is a rare bug causing items to be removed from the masterList,
not sure when it is happening, so I added a check whenever the file is
saved. if the number of items drops below 3609 a notification window
will pop up.
Merge remote-tracking branch 'origin/master'

Conflicts:
	AC Item keeper tracker/src/searchPanel.java