regress test uninstall scripts

[robe]

1) Install of postgis without any adding of postgis specific user objects (e.g geometry tables, raster tables)

when you uninstall should result in database with same number of functions, operators, casts, etc as what you had before postgis install

2) Uninstall on a postgis enabled database that has postgis specific user data (e.g. geometry tables / raster tables / user views using postgis etc.) should fail.

[strk]

I'd made this kind of testing part of run_test, which would then run 3 times: 1 with postgis only, 2 with postgis and raster and 3 with postgis and topology.

[strk]

Completed with r8506.

[strk]

No wonder the count succeeded so easly.. it was counting objects from _another_ db...

[strk]

re-fixed with r8507