The state quries the user for four values: ref. picnum, target picnum, max.
ldist and a lotag. Then, for all sprites i (of ref. picnum), for all sprites j
(of target picnum), if ldist(i,j)<=maxldist, sprite j's lotag is changed to the
provided one.
Also add lunatic/test/maputil.lua, containing a similar function but allowing
to customize the selection predicates of the ref. and target sprites, as well
as the action to carry out.
git-svn-id: https://svn.eduke32.com/eduke32@4414 1a8010ca-5511-0410-912e-c29ae57300e0
