[MERGE] Fix case-sensitivity detection

[Aaron Bentley]

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Hi all,

This patch enables TreeTransform to handle case-insensitive filesystems
better.  On those systems, it will treat names that only differ in case
as duplicates.  Therefore, it will subject them to the same conflict
resolution as true duplicates get: renaming one of them to have a .moved
extension.  This applies to most (all?) bulk tree operations:
build_tree, revert and merge.

Case-sensitivity is determined by looking for a file named
.bzr/checkout/FoRMaT.  If it exists, the filesystem is presumed to be
case-insensitive.

Aaron
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