[Bf-python] [bundle scripts] unweld updated

[jean-michel soler]

1/ To respect the style guidelines
 - Single tab indenting. no mixing tabs with spaces.
 - All significant functions (more then about 10 lines long) should have 
a docstring explaining what they do, variables they receive and return.
 - Comments and variable names in US English.
 - Constant variable names all upper case.
 -  No reliance on deprecated parts of the Blender/Python API.

2/ As there is also a point bevel tool in the script bevel center, I 
have removed the  experimental bevel options .

3/ Now it works again correctly in edit mode  .

http://jmsoler.free.fr/util/blenderfile/py/new_unweld.py

Regards,
jms .