Resolve "FEATURE: mytool make an Ax2dPlot"
Closes #78
Added formatters:
- FormatterListToLine: transform a list into datas for a line plot
- FormatterArrayToLines: transform an array into datas for multi-lines plot
- FormatterAppendToLines: transform an column array (each column is a different dataset) into data for multi-line plot.
Added Ax2dPlots: This plot takes now over Axplot2d and Axplots2d it can take formatters and much more keywords see source.
Added the tests for the formatters and test ax2dplots in the tutorials.
Both tests and tutorials are part of the continuous integration.