Allow assigning duplicate base fields

[robcxyz]

Calling this:

local->: tackle args.yaml --no_input

Raises type error here:

            try:
                hook = Hook(
                    **hook_dict,
                    input_context=context.input_context,
                    public_context=context.public_context,
                    private_context=context.private_context,

Added

            tmp_no_input = None if 'no_input' not in hook_dict else hook_dict.pop('no_input')
# and 
                    no_input=context.no_input if tmp_no_input is None else tmp_no_input,

But this is hacky. Should be managed through composition which will reduce conflicts.

[robcxyz]

Fixed in 0.6.x