disable purchases from factories from which you cannot buy

add release notes for v1.0.6

Merge pull request #160 from nbtdev/sa-drop-repairs

fix sector assault drop logging with repairs

update raid rules to reflect new credit values

Merge pull request #141 from nbtdev/implement-sector-raid-logging

Implement sector raid logging

Merge pull request #103 from nbtdev/nbt-client-99

[nbt-clent-99] Review faction diplomacy