fixup git reset helper to use checkout when file resets are requested #1326
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This fixes #1136 by making the reset helper conditionally use checkout under the covers. it will only do this if a file is specified, which is in line with the usages of git reset. reset only takes a file path in the case where you are not doing a soft, hard, or mixed reset to a ref.
I also added an explicit open to the Fake.Git.CommandHelper module to make it easier to use this module by sending it to FSI. This also has the nice side effect of more accurately tracing dependencies across Fake modules.