Add a (still empty) framework for GIS conversion.
These functions are encapsulated in a new source file oracle_gis.c.
The definition of oracleSession is moved to oracle_fdw.h so that it is accessible from oracle_gis.c.
dummy that returns an empty point
implemented utility functions
added define for hex encoding
fixed hex conversion
added MultiPoint and MultiLine
fixed a bug and adde comments
added multipolygons
comment styling
Merge pull request #10 from vmora/gis

I'll continue working on it.
first step of pg->oracle geom conversion
added pg->ora for Lines and Polygons
Add geometry support for SELECT.
The interface between oracle_gis.c and the rest of the world got modified quite a bit.
There is no support for RETURNING or DML, and there are bugs.
added MultiGeom pg->ora conversion
Fix merge conflicts caused by concurrent modifications.
Merge branch 'vmora-gis' into gis
indianness runtime test
added custom assert macro
fix crash on init
forgotten debug stop