Enhancements to crash mining tool

* Tracker management to the mining tool (Redmine by now)
* Be notified by mail when a crash is uploaded/marked as duplicated to the tracker
* Store the original URL and the duplicates crash file names in the Crash DB
* Have, at least, two apport configurations to try to retrace a crash
* Have a python script to upload a crash report to a crashreport site.
s/were/was/