[WIP] Fixes for "deploy from Windows"

The changes necessary to get brooklyn-sample running on Windows. Must be started with "-Djava.io.tmpdir=C:/temp"


I think we can treat them as absolute can't we?

I take your point it's relative to current drive but it's not relative to the CWD on that drive so it is "more absolute" than a path relative to CWD, and I think that's what we care about -- isn't it the case that whenever this method is used we are wondering whether we should interpret it as relative to some known base dir (often not CWD).  On windows if it starts with `/` or `\` or `x:` then we should not interpret it as relative to that base dir, but rather we should treat it as an absolute path.  The worst that will happen is that this will break if user runs from `D:` but expects absolute paths (in this weak sense) resolved relative to `C:` but never specified `C:/path` only `/path`.  That feels acceptable, no?