Bugfix: Adding of NPC Corps failed in some environments

When manually posting a killmail, adding an NPC corp failed with an SQL
error in some MySQL environments (due to an empty string not considered
NULL in date_format() function).
Thanks to Lum
Added: Generic inventory flag handling, CREST parser

- changed handling of item locations to generic handling using CCP's
  inventory flags
- added CREST killmail parser (no admin option yet for activating)
- database update of core tables for holding CREST hash
- Bugfix: Killmail parsers now correctly handles "Other" Bay
- Bugfix: Raw Killmail display now adds a correct moon name to the victim
  (if applicable)
- set killboard version to 4.0.8.0
- changed database packages for respecting number and NULL values
DB Update: removed obsolete database package files
Bugfix: Handling of item locations from old feeds

IDFeed v1.1 (EDK 4.0.7.0 and below) returns inventory flag 0 for fitted
items, and an empty string as edkapi version. IDfeed v1.2 (EDK 4.0.8.0 and
above) will now check for an empty or lesser IDFeed version and assign
zero-value flags on incoming items to their appropriate slot
Bugfix: Set DBUpdate config value during install

Removed DBUpdate value from config.data as it was redundant. During
install the value for DBUpdate will be taken from constants.php and set
correctly to the latest version.
Remove obsolete DB update availale msg from admin main menu