RFC 26 - MapServer Terminology Cleanup

[Steve Lime]

Hi all: Another 5.0 RFC. This one involves fixing some terminology issues that have tended to confuse folks learning the software over the years. 

  http://mapserver.gis.umn.edu/development/rfc/ms-rfc-26

In a nutshell we are proposing altering several mapfile and C representations of confusing parameters (e.g. ...SCALE and TRANSPARENCY). Mapfile level backwards compatability would be preserved (e.g. TRANSPARENCY 75 and OPACITY 75 would produce the same result). However, C/MapScript API compatability would be broken at 5.0 for these parameters (e.g. $layer->{transparency} would break and would need to be changed to $map->{opacity} = 75.

Comments welcome.

Steve