SWIG mapscript removeLayer() comment

[Adam Ryan]

Woe is the SWIG mapscript user who really wants to help in the development
of mapserver but works in a Windows shop and could never figure out how to
compile Mapserver and even if he (or she) could they don't know c so
combing through the mapserver c files for their particular solution is
pointless, though nonetheless attempted.  I defer:

Doing mapObj.removeLayer() on a layer with a resultCache fouls up other
resultCache objects of layers with higher index values.  If layer to be
removed is turned off instead, no errors ensue.

So I found a work around for myself and thought I'd share it.

Cheers,

Adam