Add new configuration system

[eseifert]

A new way for configuring plots should be added: Additionally to adjusting the settings for each element there shuld be a way to pass a single Map which contains the visual properties for the plot. This would be a kind of stylesheet and could be shared across several plots.

Imported from trac ticket 9, created by eseifert on 05-29-2010 at 18:19, last modified: 05-29-2010 at 18:19