BIG UPDATE:
Added proper entity damage calculation, verified and working, based on inverse square law.
Fixed a misconception that led to some bugs in the raytrace library (seriously, Minetest coordinates can be weird)
Fixed a bug (bred from the same misconception) regarding explosion positions and entity positions.
Fixed a bug that caused blast resistant blocks to still succumb to blast damage.
Added support for "ignore" as well as "air" node types.
Other small things :P