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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changeset:   0:9c2cf2b35aa7

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user:        test

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date:        Mon Jan 12 13:46:40 1970 +0000

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summary:     add foo

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changeset:   1:3756a9556b89

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tag:         tip

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user:        test

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date:        Mon Jan 12 13:46:41 1970 +0000

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summary:     change foo

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2 revisions:

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3756a9556b89