* configure.in: raise version, require slightly newer glib (2.10)

	* src/compil.c, src/dict.[ch], src/eval.[ch], src/lexer.l,
	  src/parse.y, src/parseutil.[ch], src/structs.h:  Add local
	  variables (not seen by higher contexts).  Also fix several minor
	  issues relating to dictionaries and lookup, mainly subst list
	  function is not substituted again if it is passed up and down the
	  contexts, and substitution is done in a smarter way.

	* src/dict.[ch], src/gnome-genius.c: Redo the way contexts are done
	  to get rid of some gslists

	* src/mpwrap.[ch]: allocate new real nums in a smarter way (by large
	  blocks) and put no limit on the number of real number structures
	  on the free list.

	* src/geniustests.txt, src/testscope.gel:  Add scope tests