Added frozendict type to sipsimple/core.util.pxi

Ignore-this: d2f0004b0ed8ced4c9349f1d98df5af2

darcs-hash:20090601153026-1e3d8-b7b463c24c3300eef0f85cdce7b65cf078e78e8b
Added frozenlist type to sipsimple/core.util.pxi

Ignore-this: 69a3ba7aa4d3a162d5f0905ff2856bf4

darcs-hash:20090601153046-1e3d8-ac6e1fa3076fde5f33ea8510627a016b47dd02aa