- public interface to the style provider dictionary by two functions
registerdefaultprovider and getdefaultprovider
- style instance variables provide and need renamed to providesdata
and needsdata
- styledata container splitted into privatedata and sharedata
(now it is possible to use several instances of the same style at
the very same time)
- partially implemented a new barpos and bar style, which are much
closer to _vrange and the rect style; stacking of bars shall become
possible by using several instances of barpos and bar in a styles list
(this simplifies the components and greatly enhances the flexibility)
git-svn-id: https://pyx.svn.sourceforge.net/svnroot/pyx/trunk/pyx@1802 069f4177-920e-0410-937b-c2a4a81bcd90