Update on next release.

2-29-2012
Fixed (improved) instance creation methods in SimpleTagImpl.
Changed StyleInfo toString(); doesn't automatically prepend the dot. Better namaing now.
Changed _addDef() to match change in StyleInfo.

3-1-2012
Added numeric attribute clamping method to Tag.
Added numeric and clamping methods to StyleInfo.
Retrofitted StylePen and subclasses to take advantage of numeric & clamp methods.
Started retrofitting clamp methods to other tags.
Started rewrite of GPGenerator; streamlining code. Each generator has its own class.