Adjust description of tomhenderson repo.

Tom's repo is now a clone of the official repo and has an mttr branch
off of 0.99.17.

HACKING.pending

@@ -27,10 +27,8 @@ 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
-multi-topology routing support for OSPF.
-
-(This repository does not appear to be a clone of the main quagga
-repository.)
+multi-topology routing support for OSPF.  Work on this repository
+takes place on the branch mtr, which has a branch poing of 0.99.17
 
 * posted patches
 
@@ -47,3 +45,5 @@ against 0.99.9 at
 
 Both patches include functional enhancements as well as support for
 gcc 2.95.
+
+[TODO: Are any of these obsolete with respect to mtr/mtr?]