store %env manipulations in ipy_exportdb.py

corrected slight oops in win32 set_term_title

update changelog

a bit longer prompt for sh profile, p4d func in ipy_p4

changelog, version number

set_term_title for win32

Fix bug that surfaced when the igrid input raised an exception.

Set version number to 0.8.1.rc1 for testing release

update revnum

module completer caches the root module list if it was too slow (3 secs) %rehashx clears the cache