Trim application manifests as much as MS' documentation and Owen's experiments

Trim application manifests as much as MS' documentation and Owen's experiments
on XP allow while still having the desired effect -- this allows removal of
some fibs.
Also, change version number to 0.0.0.0 in preparation for `win-versioninfo'
(not that we found anything that took any notice of the version number
declared here).

git-svn-id: svn://svn.tartarus.org/sgt/putty@5534 cda61777-01e9-0310-a592-d414129be87e