Try to make our PGP signing more useful:

* All the PuTTY tools for Windows and Unix now contain the fingerprints of
   the Master Keys. The method for accessing them is crude but universal:
   a new "-pgpfp" command-line option. (Except Unix PuTTYgen, which takes
   "--pgpfp" just to be awkward.)

 * Move the key policy discussion from putty-website/keys.html to
   putty/doc/pgpkeys.but, and autogenerate the former from the latter.
   Also tweak the text somewhat and include the fingerprints of the
   Master Keys themselves.
   (I've merged the existing autogeneration scripts into a single new
   one; I've left the old scripts and keys.html around until such time
   as the webmonster reviews the changes and plumbs in the new script;
   he should remove the old files then.)

[originally from svn r5524]
[this svn revision also touched putty-website]

windows/window.c

@@ -479,6 +479,9 @@ int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show)
 		    sfree(s1);
 		    sfree(s2);
 		    exit(0);
+		} else if (!strcmp(p, "-pgpfp")) {
+		    pgp_fingerprints();
+		    exit(1);
 		} else if (*p != '-') {
 		    char *q = p;
 		    if (got_host) {