babeld: Initial import, for Babel routing protocol.

* Initial import of the Babel routing protocol, ported to Quagga.
* LICENCE: Update the original LICENCE file to include all known potentially
  applicable copyright claims.  Ask that any future contributors to babeld/
  grant MIT/X11 licence to their work.
* *.{c,h}: Add GPL headers, in according with the SFLC guidance on
  dealing with potentially mixed GPL/other licensed work, at:

  https://www.softwarefreedom.org/resources/2007/gpl-non-gpl-collaboration.html
diff --git a/lib/memtypes.c b/lib/memtypes.c
index d2bc1c6..cd39c99 100644
--- a/lib/memtypes.c
+++ b/lib/memtypes.c
@@ -174,6 +174,13 @@
   { -1, NULL }
 };
 
+struct memory_list memory_list_babel[] =
+{
+  { MTYPE_BABEL,              "Babel structure"			},
+  { MTYPE_BABEL_IF,           "Babel interface"			},
+  { -1, NULL }
+};
+
 struct memory_list memory_list_ospf[] =
 {
   { MTYPE_OSPF_TOP,           "OSPF top"			},