Sloped Minifig Leg 3817b is wrong

[Philippe Hurbain]

I'll fix these things in the evening and upload it as c version. 

I made an experiment to see how difficult it is to adapt an existing pattern with "b" leg geometry to corrected "c" geometry.
See https://www.ldraw.org/cgi-bin/ptdetail.c...6cpc6a.dat (and related)

I chose this one as it was a good case with front/side/toe pattern.
The most tricky part is the adaptation of front curved subpart, shortened at bottom. Adaptation made using LDPE only.

Credit/history scheme follows the same pattern used when going from initial to "b" geometry.