- reorganized all the theorems, so it's more readable.
- moved no-consume theorems to this file.
- removed false-implies-equiv and equiv-respects-eq, since they're already
  in permission.elf
- fixed some format
- efxmap-remove-tgtmap-implies-permission-combine*
- efxmap`deep-disjoint-join-preserves-wf-converse (trustme)
- efxmap`remove-tgtmap-leq-implies-leq
- inner-efxmap`no-consume-respects-eq
- inner-efxmap`fresh-update-preserves-no-consume-converse
- efxmap`lookup-implies-no-consume
- efxmap`update-preserves-no-consume
- efxmap`fresh-update-preserves-no-consume-converse
- set2inner-efxmap-no-consume
- NOT WORKING
- checkin before switching branch.
- fresh-implies-unit-deep-disjoint
- deep-disjoint-join-commutative
- leq-deep-disjoint-implies-empty
- join-deep-disjoint-right-leq-implies-leq
- use data`size instead of data`wf. (the latter turns out to be a bad idea)
- minor changes .
- use data'size instead of data`wf. The latter only make things more complicated.
- moved shift-preserves-set+nat2tgtmap into tgtmap2efxmap.elf
- set`disjoint-join-commutative = set`disjoint-union-commutative.
- 2013-06-30
- moved set+nat2tgtmap here
-