Document map rotation options

[dmorissette]

The new map rotation feature is only documented in a wiki page at:
http://mapserver.gis.umn.edu/cgi-bin/wiki.pl?MapRotation

A few issues with this:
- The wiki is frozen so we cannot update it to reflect changes made in bug 1135
- The "AUTO" map-level parameter is not documented in the mapfile-reference doc

This is not assigned to anyone yet, just filing this here so that we address it
if/when someone has time.

[jmckenna@…]

will update the mapfile-reference doc for this now

[jmckenna@…]

Daniel you mention the '"AUTO" map-level parameter'...from my understanding of
bug#1135 am i correct that you are referring to the rules regarding map ANGLE
and layer LABELANGLEITEM settings, and that there is in fact no 'AUTO' setting
for this anymore (frank removed that processing option)?  i think i am right
about this, just making sure, because your 'AUTO map-level parameter' wording
makes it sound like there is a new 'AUTO' mapfile setting.

[jmckenna@…]

updated the mapfile reference doc for map ANGLE, layer LABELANGLEITEM, and layer
ANGLE rules.  committed in 4.6 only, because during testing found different
results with 4.4.2.