more regression testing with GSERIALIZED_ON
|Reported by:||robe||Owned by:||robe|
Or test after is turned GSERIALIZED_ON in gserialized.h and all relevant dead code is removed.
- check again that all the regression failures are actually ones we're
willing to accept (they are mostly about slight changes in the output of M-valued geometries in nested WKT, and Paul has decided they are "good" regressions)