wxMathPlot 0.1.2 Released!

After a long wait wxMathPlot 0.1.2 is finally out. the main new features are:
* Can now build as a DLL on Windows (works only if wxWidgets are built as DLL) (patch by zundoya)
* Reimplemented scrollers (patch by ngpaton)
* Added mpX_DATE and mpX_DATETIME formats for X axis.
* Axes labels' format can now be set using the SetLabelFormat function, so the user can select the appropriate format fitting his needs.
* Introduced mpWindow::SetColourTheme to set background and foreground colors different from default black on white. mpPrintout will continue to print everything with white background.
* Fixed drawing of labels for mpFX, mpFY and mpFXY.
* Fixed evaluation of m_posY in mpWindow::Fit (margin top to be added, not subtracted)
* Fixed mpFXYVector (and mpFXY) which did not respected margins when set as continuous
* MATHPLOT_DO_LOGGING is now an option to be enabled by CMake building (no more annoying debug infos if not needed)
* Minor fixes.