Symbolization: some more minor schema changes

[waltweltonlair]

We need to make the following changes to the symbol definition schema:

• update default value for AngleControl (in PointUsage/LineUsage/AreaUsage) to FromAngle
• add "Use/Match/Follow/From?-HorizontalAlignment" value (final name still TBD) to Justification enumeration, and make this the default property value
• add optional DataType value to Parameter element
• remove AllowedValues element and add next release once we decide how to do ranges of values

I would really like to make these schema changes before we release. The fewer changes we have to make later on the better.

[waltweltonlair]

One more I missed:

• LineUsage needs a VertexMiterLimit property. This is analogous to LineJoin / LineMiterLimit, and is used in the case where the VertexJoin is set to type miter.

[waltweltonlair]

Fixed by submission  http://trac.osgeo.org/mapguide/changeset/1695.