Adding labels with names of elements in each circle

[ribosaki]

Currently, the diagrams are generated with two labels at each circle in the Venn diagram. These labels correspond to the number of elements withing each circle and to the number of the circles these elements belong two.

In some cases it might be interesting to have also all the names of all the element within each group. It would also be very useful if the names of the elements within each group are extracted automatically by the perl script that generates the ascii input file the the program generating the diagrams.

So, this issue is a suggestion for improvement.