[MERGE] TestCaseWithMemoryTransport

[Robert Collins]

This patch add TestCaseWithMemoryTransport, a base class between
TestCase and TestCaseInTempDir.

It does not setup per-test test directories, and calls to get_transport
always get MemoryTransport. it does not have make_branch_and_tree,
rather it has make_branch_and_memory_tree() only, allowing this to be
used for very fast precise tests.

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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