Add a configuration option when docking and undocking to enable or disable the stockpile setting on tanks.

[docking]
ManageTanks=true

Minor fixes

* Only auto-detect airlocks on the same grid (it never controlled airlocks on other grids)
* Make the automatically detected airlock default delay 0.5 seconds instead of 0 seconds

Updated the description about how the automatic airlock detection works. Groups must contain the word Airlock in their name.