Well, we can now add keys and values and delete keys and values ...

Well, we can now add keys and values and delete keys and values ...

Lots more to do, like handling regular expressions for keys, and input of
the security descriptors, etc. However, I now have to work on writing the
in-memory tree out to a file in a format that Windows can understand.
(This used to be commit 562b36510c704eba84b036aacdb1f984339afafc)