Bugfix: Honor pickup_burden when picking up gold.

Picking up gold didn't honor the setting of pickup_burden if
the game is compiled without GOLD_OBJ (no prompt when the
encumbrance level is exceeded).


git-svn-id: https://unnethack.svn.sourceforge.net/svnroot/unnethack/trunk@1207 f1e491ac-5ded-4967-80bf-9f4855be876a
Fix Sheol monsters appearing outside Sheol.
Fix Sheol-only monster statue traps appearing outside Sheol.

...is what I think it fixes (possibly among with some other Sheol-only
monster generation bugs) but I was too lazy to properly test if those
incorrect statue traps were generated in the first place. Just don't tell
anyone, ok?