excavation gear belts can now hold pick sets, pick sets can no longer hold hand picks (they spawn in the locker instead), picks and measuring tapes now work much faster

Signed-off-by: Cael Aislinn <cael_aislinn@yahoo.com.au>
depth scanner should now properly show the responsive material of a find

Signed-off-by: Cael Aislinn <cael_aislinn@yahoo.com.au>
halved the length of xenoarch scans, scans actually shut down when they exceed the safety by too much

Signed-off-by: Cael Aislinn <cael_aislinn@yahoo.com.au>
changelog update

Signed-off-by: Cael Aislinn <cael_aislinn@yahoo.com.au>
Merge pull request #3134 from caelaislinn/master

Xenoarchaeology tweaks