[MetaCRS] Standard (and simple) format for conversion tests.

[Martin Desruisseaux]

Hello all

I would like to support the project of a common test database as well. I could 
contribute by porting the Geotk scripts if wanted. There is a few minor comments:

1) Maybe the tolerance should be specified for each axis, instead than one
    value applying to all axis. This is more useful when the target CRS is a
    geographic one, since the tolerance on longitude can become greater as we
    approach the pole. At the extreme case (point a North pole or South pole),
    the longitude is meanless and should have a tolerance of +/- 180°

2) Maybe the axis order should be "as the authority said" (useful for testing
    libraries to be used with recent WMS/WCS versions), instead than forced to
    "X Y Z" order. As a help for libraries that do not handle axis ordering,
    we could add a field telling what the order is for the current record.

3) EPSG does not provide explicit test suite to my knowledge, but they provide
    some examples of coordinate conversions that can be used.

	Martin