Support for the newest ggplotd version

Also reenable OSX gtk builds

Legend support

This version adds support for legends.

Legends

This release adds support for plotting legends.

Update ggplotd dependency

v0.9.1

Compatibility with new ggplotd

density and density2d plots

Add support for new version of ggplotd, which makes it possible to draw density and density2d plots (smoothed hist and hist2d).

Use new version of ggplotd

ggplotd has some important bug fixes that this release pulls in.

Bug fix and support new ggplotd

v0.8.3

Support for new ggplotd version

Added support for colour gradients

v0.8.2

Colour gradient support

v0.8.1

Remove reference to old command line interface in README

Use ggplotd as the backend and changes to commandline interface

Note the command line interface of version >=0.8 is incompatible with the interface <0.8

During this update we switched from using cairoD directly to building on ggplotd for the drawing. We also revamped the command line options. This means that you cannot use plotcli with the same arguments as before. This change was made because the new version more directly maps to ggplotd design, making it easier to support all the power of ggplotd, just from the command line.

As a side benefit it also allows us more freedom, because it enables us to use the same column both for x data and for y data, which allows us much more freedom in how to create multiple plots. I.e. if I want to plot column 1 versus column 2 and column 3 versus column 1, this is now possible.