File/directory removed in FS browsers - breakpoints must be deleted as well

[GoogleCodeExporter]

Currently, if a file or directory was deleted from either a project browser or 
a file system browser, the breakpoints will stay in the list.

It is not a danger because they will be deleted when:
- this project is loaded again
- or a new debugging session is started

Nevertheless it would be nicer if the breakpoints in explicitly deleted files 
are deleted straight away.

See projectviewer.py -> __removeItem() method

Original issue reported on code.google.com by sergey.s...@gmail.com on 27 May 2013 at 9:36