Merge of #545 branch before closing the branch.
Was already merged in Bitbucket before import, marked as merged by the import user
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Minor. Comments + clean up.
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Update versions of JavaHg to 0.13 an Guava to 18.0. Remove dependencies to JavaHg extensions. (transplanted from f37dff28ad98)
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Fixed "cannot pass null for --branch" error when the "Sync current branch only" preference is disabled.
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Added trace messages in order to debug Unsupported Exception messages on Oxygen.2 when setting persistent properties.
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Fixed incorrect branch specification when fetching incoming changesets into the remote cache.