All-Plot - Slope IX

... parametrisation is working in all variants (full, stack, compare)
the new "Styles" are available for processing
... to do:
- final plotting in nice colors (keep the pen provided centrally - to
have separation in compare mode)
- algorithm for time/base
- calcuate the "slope" value (meter/changed for time, slope% for
distance) and plot those as legend into the polgon boxes