HACKING: Update HACKING with anything relevant from pending and prune

* HACKING.md: Add USEFUL URLs section, add link to patchwork
* HACKING.pending: Prune out stuff moved to HACKING or well out of date or
  unreachable.
Tested-by: NetDEF CI System <cisystem@netdef.org>

HACKING.md

@@ -498,3 +498,10 @@ from ‘master’:
 
 presuming ‘quagga’ corresponds to a file in your .git/remotes with
 configuration for the appropriate Quagga.net repository.
+
+USEFUL URLs
+===========
+
+* David Lamparter <equinox@diac24.net> runs a patchwork instance at
+  <http://patchwork.quagga.net/project/quagga/list/>
+

HACKING.pending

@@ -1,34 +1,8 @@
 This file contains pointers to work done on quagga that is not in the
 quagga git repository or quagga bugzilla.
 
-* bug/patch trackers
-
-** diac24 patchwork instance
-
-David Lamparter <equinox@diac24.net> runs a patchwork instance at
-
-  http://patchwork.diac24.net/project/quagga/list/
-
-which contains about 225 patches to quagga.  Many of these are
-collected in his git repository.
-
 * public git repositories
 
-** git remote add quagga-re git://github.com/Quagga-RE/quagga-RE.git
-
-Maintained by Denis Ovsienko, and geared towards producing a
-production-ready branch of Quagga, in the Quagga-RE-stable branch.
-
-** git remote add equinox git://git.spaceboyz.net/equinox/quagga.git/
-
-This repository has topic branches for patches intended for inclusion
-in the main quagga tree, named patches/, plus some other branches.
-
-** git remote add balajig http://github.com/balajig/quagga-next.git 
-
-Balaji G has prepared a git repository where a number of patches to
-the list have been stored.
-
 ** git remote add mtr http://github.com/tomhenderson/quagga-mtr.git
 
 Tom Henderson of Boeing has created a repository to work on
@@ -36,19 +10,3 @@ multi-topology routing support for OSPF.  Work on this repository
 takes place on the branch mtr, which has a branch point of 0.99.17
 
 * posted patches
-
-** Boeing
-
-Boeing has posted patches
-
-  quagga-0.99.9.ospfv3-addressfamilies.patch
-  quagga-0.99.9.ospfv3-manetmdr.patch
-
-against 0.99.9 at
-
-  http://hipserver.mct.phantomworks.org/ietf/ospf/
-
-Both patches include functional enhancements as well as support for
-gcc 2.95.
-
-[TODO: Are any of these obsolete with respect to mtr/mtr?]