add catepie chart creation for numerals
rectify comment
sort elements to ease later processing (and have nicer output)
speed improvement for data placement in category-creation (based on pre-sorted data)
add column name to category name
slight improvement of numeral selection function
drop usage of index
add dataset and column name to pie chart
improve initialization of pie chart (only load once the data is there)
clean up numeral category dialog
show naming of numeral category
allow fine-grained limit choosing
Fix:missing <= in category name
Merge branch 'origin/piechart_experimental'