Renamed some variables.  Added functionality to delete tmp working directory.  Added test to verify a resource after an OGR_xx_DestroyXX() function.  Modified messages in Assert commands. Added testOGR_L_CreateField0().  Cleaned up.
Renamed some variables.  Added functionality to delete
tmp working directory.  Added test to verify a resource after an
OGR_xx_DestroyXX() function.  Modified messages in Assert commands.
Added testOGR_L_CreateField0().  Cleaned up.

ejn/php_ogr,faegi/php_ogr,faegi/php_ogr,faegi/php_ogr,ejn/php_ogr,ejn/php_ogr,faegi/php_ogr