Some functions need to be wrapped in the ``_MapdlCore`` class

[clatapie]

This follows @germa89's comment:

@wraps(_MapdlCore.kcenter)
def kcenter(*args, **kwargs):
    return parse.parse_kpoint(super().kcenter(*args, **kwargs)

Same as the ED commands, just different wrapped function.

Originally posted by @germa89 in #4262 (comment)

Concerned functions (to be updated):

• kcenter