correct prefix issues on unix systems
fix zoom problems with stopwatch
changes to avoid assertions on wx-3.0
correct line width and opengl settings for antialiased grid lines
several fixes found for wx-3.0 on macosx, however these potentially benefit other platforms
slight fix for wx-2.8
Merge pull request #129 from seandepagnier/master

various small bugfixes
Prototype core modifications to support vector chart objects delivery to
plugins
Support CM93
Add a TODO note about CM93 objects
Add handling of _texto/_texta for CM93 charts
Add a TODO note about CM93 objects
Add handling of _texto/_texta for CM93 charts
Add support for chart scale
Correct the plugin path