get git-annex working even if user doesn't add git to path

This is pretty complicated, but I have both "git-annex" and "git annex"
working both in the git bash shell even with git not added to path.
And, when git's added to path, both work from MS-DOS prompt window too.

I think that the webapp startup does still need git in path, so
instructions will keep saying to do that. But, users often disregard them,
and hopefully this will reduce support traffic.

Also, switched the wget from the cygwin one to the msys2 one, avoiding the
complication of needing to bundle any cygwin dlls.

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