- add new module 'utils', to hold various SIP message related functionality

- add a function to convert 183 messages (for example in parallel call)
  to 180 (derived from some internal module that we implemented long ago)
- Credits for the original code belongs to Hardy Kahl, hardy dot kahl at 1und1 dot de
- write some doxygen comments, write user documentation, add timeout value
  as parameter, add new module to test 2
- in the near term some other functions of small modules will be moved to
  this place, e.g. maxfwd, some new contributions are also planned to be
  placed here


git-svn-id: https://openser.svn.sourceforge.net/svnroot/openser/trunk@5202 689a6050-402a-0410-94f2-e92a70836424

test/unit/2.cfg

@@ -47,6 +47,7 @@ loadmodule "uri/uri.so"
 loadmodule "uri_db/uri_db.so"
 loadmodule "usrloc/usrloc.so"
 loadmodule "userblacklist/userblacklist.so"
+loadmodule "utils/utils.so"
 loadmodule "registrar/registrar.so"
 loadmodule "permissions/permissions.so"
 loadmodule "pdt/pdt.so"