Changelog:
* New Curve type, based on the ISO SQL/MM model for curves.
* Index binding for curves, allowing them to use the same R-Tree indexes as the other types.
* Serialization and deserialization functions for Curve, allowing them to be dumped and restored.
* Performance shortcuts for Contains and Within to optimize point-in-polygon case.
* Support for most of the ST_* and SE_* spatial SQL functions used by the ESRI ArcSDE spatial SQL interfaces.
* Documentation of the new SQL/MM functions and Curve types.
PR: ports/107489
Submitted by: Anderson S. Ferreira <anderson@cnpm.embrapa.br> (maintainer)
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