Unbinding POBoxes from MailBox.Owner

All players can use any Mailbox to access their own (and no one elses)
mail (POBox). Fixes #106
Merge pull request #140 from Vexatos/master-origin

Optimized custom x-alyzer species names, they now depend on the type.
Fixing persistence of the PostOffice

Fixes #136
Fixed too much localization.