[MERGE] Avoid losing data when converting a local branch to a lightweight checkout

[Aaron Bentley]

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Hi all,

Reconfigure doesn't do enough safety checks when converting something
into a lightweight checkout.  It should not succeed (unless forced) if
the local branch is out of sync with the branch that would be used as
the reference branch.

This patch adds those checks, so that if the branches aren't in sync,
the reconfiguration fails.

Aaron
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