[survey] Document the SiteRanges field in the manual

Update check for KSP 1.12

I haven't tested 1.11, but if it works for 1.9 (and 1.8 was tested for
me back in December) 1.10, and 1.12, then surely 1.11 is good, too :P

Add docs for the new ELWorkNode interface

Merge branch 'dev' into master

Update ISRU contract part requests

Forgot about these when prefixing the parts

Add a quick and dirty IVA to launchpad2

Fixes taniwha#104

Fix NRE when clearing loaded craft

Actually search the part's nodes for non-top/bottom

It does help if one fetches the node before testing it.

Allow KSP versions 1.8 or 1.9

Update version check for KSP 1.8.1