[merge] allow for testing multiple Inventory implementations

[Aaron Bentley]

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Aaron Bentley wrote:
> Martin Pool wrote:
>> This reorganizes the Inventory tests to allow us to add and then test a
>> new better Inventory class.  It also moves two tests for is_inside_any
>> and is_inside_or_parent_of_any into test_osutils, because they're
>> osutils functions and apparently not strongly related to the inventory.

Oh, also:  This patch introduces some trailing whitespace.  "bzr cdiff
- --check-style" will tell you about that.

Aaron
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