Issue a warning if "-r ." is used with two working directory parents. Rationale for not aborting instead: The first parent is usually more important as it is the local branch during a merge and commands like 'hg diff' and 'hg diff -r.' behave still identically (except for the warning of course). Added a test for log -r. with one and two parents.

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%% no changes

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%% uncompressed contents in repo

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this is a test

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%% uncompress our working dir copy

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this is a test

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1 files updated, 0 files merged, 0 files removed, 0 files unresolved

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%% uncompress our new working dir copy

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this is a test