Help/helpfile patches for Vanilla 2.9.2beta.

Page 1: Fixed some misnamed flags in the help files.
	src/tables.c		lib/help/option.txt
	easy_floor		easy_piles
	floor_query_flag	other_query_flag
	run_ignore_stairs	find_ignore_stairs
	run_ignore_doors	find_ignore_doors
	run_cut_corners		find_cut
	run_use_corners		find_examine
	expand_list		expand_wrap

Page 2: Added some more help.
  Also, when the '?' command takes you directly to some particular
  section, another '?' will take you "back" to the help.hlp menu.
  Otherwise other helpfiles would not be available.