Log Message:
Update to 0.99.22.3.

Update HOMEPAGE, MASTER_SITES.
Set USE_GNU_READLINE to catch up to 2012Q3 devel/readline builtin detection.

0.99.22.3 basically contains a security bugfix for OSPF-API.
0.99.22.2 was not released.
0.99.22.1 contains a few non-security bugfixes.

Changes in 0.99.22 since 0.99.21:

- [bgpd] The semantics of default-originate route-map have changed.
  The route-map is now used to advertise the default route conditionally.
  The old behaviour which allowed to set attributes on the originated
  default route is no longer supported.
- [bgpd] There is now a replace-as option to neighbor ... local-as ...
  no-prepend.  For details, refer to the user documentation.
- [zebra] An FPM interface has been added.  This provides an alternate
  interface to routing information and is geared at OpenFlow & co.
- [snmp] AgentX is now supported;  the old smux backend is considered
  deprecated.  ospf6d has also had OSPFV3-MIB added.
- [*] several issues with configuration save/load/apply have been fixed,
  in particular on ospf "max-metric router-lsa administrative" and
  "distribute-list", bgpd "no neighbor activate", isisd \ 
"metric-style",
- [*] a lot of bugs have been fixed, please refer to the git log