Debugger: Fix QUrl dumper for Qt 4

Change-Id: I3a162bd7b8f181b8f337194004baee065b1c96ac
Reviewed-by: hjk <hjk121@nokiamail.com>
Debugger: Add button to debug python dumpers

This searches the last 'bb' command and triggers a re-run with
the 'pe' option added.

Change-Id: Icbe251c9f8980f3bcd0ba10171ec39f0fb02c2f4
Reviewed-by: hjk <hjk121@nokiamail.com>