various merge improvements
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Hash: SHA1
various merge improvements
add -C flag: force update and overwrite local changes
add -m flag: allow merges with conflicts
we no longer do merge by default
and we print a warning message when the merge fails
fix bug in printing merge failure message
fix bug diffing files in 'm' state
manifest hash: 75545a6db45d1e371082343d01c9f177df0f9db3
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