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]

putty.h

@@ -27,6 +27,15 @@ typedef struct terminal_tag Terminal;
 #include "network.h"
 #include "misc.h"
 
+/*
+ * Fingerprints of the PGP master keys that can be used to establish a trust
+ * path between an executable and other files.
+ */
+#define PGP_RSA_MASTER_KEY_FP \
+    "8F 15 97 DA 25 30 AB 0D  88 D1 92 54 11 CF 0C 4C"
+#define PGP_DSA_MASTER_KEY_FP \
+    "313C 3E76 4B74 C2C5 F2AE  83A8 4F5E 6DF5 6A93 B34E"
+
 /* Three attribute types: 
  * The ATTRs (normal attributes) are stored with the characters in
  * the main display arrays
@@ -893,9 +902,10 @@ int wc_match(const char *wildcard, const char *target);
 int wc_unescape(char *output, const char *wildcard);
 
 /*
- * Exports from windlg.c
+ * Exports from frontend (windlg.c etc)
  */
 void logevent(void *frontend, const char *);
+void pgp_fingerprints(void);
 /*
  * verify_ssh_host_key() can return one of three values:
  *