core: include <netinet/in.h> in new dns_func.c file to fix compilation of freebsd

- patch by Victor V. Kustov
modules/sipt refactor get functions into pvars

return value of 0 in a function causes the script to exit, so
pvars are used instead to safely get the values

also getting screening and presentation information added
modules/sipt regenerate README with new api
modules/sipt forgot to stage the documentation (pvars added)
uac: added possibility to authenticate generated requests

- $uac_req(auser) - specify the authentication username
- $uac_req(apasswd) - specify the authentication password
- if both attributes above are set and the request is challenged with
  401/407, then the request is resent with auth header
docbook: uptdated wiki link in entities file
uac: regenerated readme with new wiki link
usrloc: re-init sruid struct for each child

- avoid overapping values for xmlrpc handling
modules/sipt add value tables to docs, add section ids to pvars
core: fix default read-only DB URL
modules/rr: add double record-routes when outbound is enabled

- Note: loose.c does not yet handle these properly
modules/rr: refactored process_outbound()

- Still need to update loose.c to properly handle double-RRs with flow-tokens
sqlops: use one char buf for empty strings in db results

- safe for the parts of code that want to access it even for write
registrar: added debug message to print generated ruid for contact

- formatted condition to fit 80 char long line
core: new global parameter - modinit_delay

- sepecify microseconds to sleep after initializing a module in order to
  cope with systems having rate limits on new connections to db or other
  servers
usrloc: option to do db update/delete ops using ruid

- new parameter db_obs_ruid - if set to 1, db update/delete operations
  are done using ruid value
- if paramter set to 0 (default) the old style using aor, contact and
  call-id is done
usrloc: documented db_ops_ruid parameter
usrloc: regenerated the readme for db_ops_ruid parameter
pkg/deb: Change memcache module dependencies

libmemcached-dev is the new dependency deprecating libmemcache
pkg/deb: Deprecate lenny

Lenny is not a supported version of debian any more.
At sip-router squeeze and wheezy are being mantained at the moment.
Let's deprecate lenny for future releases.