Bug 293230

Version:           2.0.4
OS:                Linux

In Kst 1.x it was possible to set legend entries used for the curves manually and independently from the curve name, so that it was possible to tune legends regardless of the sometimes weird names in vectors - or for some advanced usage. This is no longer possible with Kst 2.x and should be restored.
Example situation where this can be useful: see below.

Reproducible: Always

Steps to Reproduce:
- load CStk and PStk vs time from TWIN1xxx in sample_data/
- duplicate with the change data file tool to show from TWIN2 as well
- assign color per file: e.g. red for TWIN1 and blue for TWIN2
- try to show one global legend which explains that red = TWIN1 and blue=TWIN2 (I activate the legend for one plot and move it to the bottom of the window)

Actual Results:  
The only way to achieve the expected result is to change the curve names in the plot so that the legend contents are as wished. But then the curve names are only the file names, which makes it hard to handle when you have many curves and want to locate one in the data manager.

Expected Results:  
It should be possible to set the text used for the legend entry of a curve independently from the curve's name.