Removed some 140 SOURCEs of ufsdump, adding a few stubs. The program seems to

Removed some 140 SOURCEs of ufsdump, adding a few stubs. The program seems to
work on simple ufs cache files.

urlCanonical is currently an always-asserting stub. I am not sure what pulls
in urlCanonical. I know storeKeyPublicByRequest* require it, but I am not sure
which source requires storeKeyPublicByRequest. If the stub assertion fails on
some cache files, we will need to pull more sources or re-implement
urlCanonical.

The more sources are moved into libraries, the more difficult it may be to
write isolated, compact test cases or tools because test case stubs and
customizations may start to conflict with names defined in the libraries and
because pulling in a whole library might require defining more stubs. It is
not clear yet how real this concern is in general, but a lot of acl/
SourceLayout time was spent on making ufsdump build...

Context: SourceLayout: acl/, take 1