docstring overwritten by `@jitclass`

[danielcsaba]

the @jitclass decorator overwrites the docstring for instances of classes. docstrings are maintained for the methods but not for porperties.

For example, retrieving the docstring of the Normal works with

   In [1]: print(Normal.__doc__)

but does not work on an instance of the Normal:

    In [2]: N = Normal(0,1)
    In [3]: print(N.__doc__)

[mmcky]

Is this still an issue?