Fixed a typo.
Added static ZERO, UNIT_X, UNIT_Y, UNIT_Z, and ONE fields to Vector.
Replaced an if-else tree in /rement by an equivalent switch.
Flagged heads as "cannot be passed through".
Adjusted shouldPlaceLast.
Fixed portal frame height and added a few new blocks to centralTopLimit
Made cobblestone wall 1.5 high.
Optimized EditSession.countBlocks.

Also fixed the questionable semantics for that anonymous class' "contains" method.
Moved the polygonization code to the specific regions that are being polygonized.

Also, maxPoints no longer has confusing semantics.
Reduced some code duplication in the regions.
Added a ConvexPolyhedralRegion and selector
Added the polyhedral selector to //sel.