Revert "aggiunto help di int bez"

This reverts commit 998ce6ce26b45bd43af40ca1c2da84a00b5b884e.
Revert a54e3b2..98d6913

This rolls back to commit a54e3b2bf5b3b9f9275637ab320b887840d204b3.
Some Minor Changes

Added sandbox for testing
joined def calc_bez_xy and calc_bez_xy_auto
added calc_int_bez
adapted everything to work inside a classes