Enhance visualization of DataTables

[swagner]

The visualization capabilities of DataTables should be extended:

• export charts into images (done)
• flexible row coloring (done)
• tooltips (rejected)
• nicer visual appearance (done)
• multiple y-axis (done)
• different chart types (bars, lines, columns, points, etc.) (done)
• 2D scatter plots (postponed, see #1287)
• specify if points in a row start with index 0 or 1 (done)
• axes labels (done)

[swagner]

The following issues have been covered in #1237:

• export charts into images
• visual appearance

[swagner]

Worked on the following issues in r4644:

• multiple y-axis
• different chart types (bars, lines, columns, points)

[swagner]

Worked on flexible coloring and on different start indexes in r4648.

[swagner]

Worked on flexible row coloring in r4777.

[swagner]

Worked on different start indexes in r4778.

[swagner]

Rejected to implement custom tooltips as this feature is not really required and would probably have a severe impact on performance.

[swagner]

Added axis labels in r4870.

[swagner]

All remaining enhancements will not be part of the 3.3.2 release. They are covered in the follow-up ticket #1287.

[swagner]

Please especially review r4870 as this revision contains some new stuff which has not been reviewed by gkronber yet.

[mkommend]

Reviewed the code of all changesets. The only thing that should be done is to use folders to further organize the HL.Analysis project.

[swagner]

Added folders to organize the HeuristicLab.Analysis plugin in r4887.