Hide survey stakes unless KAS is installed

I think the extra code will just get ignored, with no side effects, if Module Manager is not installed, but haven't had a chance to test it.
Hide survey station unless KAS is installed
Made survey stakes stateful

Fixed issue where putting stakes in a KAS container wipes their settings (I assume it was an issue, since you mentioned it in the release notes?)
Merge pull request #74 from Starstrider42/patch-1

Hide survey stakes unless KAS is installed