Suggestion for regtool

[DJ Delorie]

> I have made a small patch to your new regtool. It's a nice tool
> but personally I hate using backslashes on the command line.

Applied.  I made up a Changelog entry.

This patch handles backslashes inconsistently.  I'd rather see it more
unix-like where backslashes always quote the next character, not just
when the next character is a slash (not that Windows would allow the
few cases that would allow).