Provide access to inline features through layerObj::getShape()

[sgillies@…]

Christoph Spoerri has provided tested code that allows MapScript access to
inline features that will be incorporated into SWIG MapScript.

One thing that bugs me about getShape is that the order of arguments is
tileindex, shapeindex.  This is exactly opposite of what it _should_ be.
Since not every call needs a tileindex, it should have been the second
argument so that we could make it optional.

[sgillies@…]

getShape should _really_ return *shapeObj, not an int, as do getLayer,
getClass, getStyle.

[sgillies@…]

layerObj.getShape now allows access to inline features through the 
msINLINELayerGetShape function in maplayer.c.  layerObj.getNumFeatures
uses msLayerGetNumFeatures().

Removing features from the linked list needs a little work yet.

[dmorissette]

Actually, when we implemented the PHP version of getShape() we made it return a
shapeObj:
     shapeObj getShape(int tileindex, int shapeindex)

[sgillies@…]

That was the right way.  I don't think we should change SWIG getShape now, but 
should wait till the next major version change.

As I said in an email to Cristoph yesterday, I decided against implementing a
method to remove inline features.  It's no good trying to treat a linked list
as if it is an array.  Maybe if we ever refactor layer->features to be an
array, but I don't think that is worth the effort.

[sgillies@…]

Closing this bug.

Just a note to mention that I am resolving the issue of an improved
getShape method in bug 586.

http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=586