FIX: Weapons list in "Ships & Weapons"

Weapons list displayed either only drones or weapons AND ships; this fix
uses an items categoryID to completely filter out ships
FIX: Installer incompatibility with new database

The installer was missing some changes to make it compatible with the
latest DB update and the new update process
Changed link to evekb.org in install step 8 template
Bump version to 4.0.7.0
Merge branch '4.0' into salvoxia

Conflicts:
	common/includes/constants.php
FIX: Wrong count for KillLists for more than one Killboard Owner

Fixed calculation of number of kills on a kill list if the killboard has
more than one owner, which lead to wrong number of sites in the page
splitter