Create zenmap.xml

Homepage: http://nmap.org/zenmap/
Fix version typo
Add Windows note & tweak descriptions
use same option id as other cleaners

option id="delete_database" is also used in release/shotwell.xml, release/zeitgeist.xml and is less vague then just id="database".
Add Zenmap description
Merge pull request #41 from tiemay/patch-1

Clean Zenmap (official Nmap Security Scanner GUI) on Linux (thanks to tiemay)