[PATCH] xmlrpc missing features implementation

hi all,

here is implementation of missing features in gwlib/xmlrpc.[ch]
the patch implements handling of structs, arrays, double type, method
response and faults.
there are some changes in interface also, so it affects smsbox.c and
test_xmlrpc.c

in octstr.[ch] function octstr_parse_double is added - used in xmlrpc
implementation
and finally trivial change in cfg.def removes duplicated xmlrp_url entry in
smsbox group

the patch is quite big, but does not affect working kannel for now, as there
is still no xmlrpc support in smsbox implemented.
I didn't add it here on purpose, to let others test patch separately without
ingeration in core kannel files.
 I use this implementation in external app working with kannel and it works
ok.

waiting for votes & commit

best regards
Robert