[Halld-offline] rcdb v0.02 crashes at invocation

[Richard Jones]

Hello Dmitry,

As has been reported earlier, rcdb v0.02 crashes at invocation on a
standard Centos 6 host.

[jonesrt at gluey rcdb]$ rcdb
Traceback (most recent call last):
  File "/home/halld/rcdb/python/rcdb/cmd.py", line 65, in <module>
    @pass_rcdb_context
  File "/home/halld/rcdb/python/click/decorators.py", line 151, in decorator
    _param_memo(f, ArgumentClass(param_decls, **attrs))
  File "/home/halld/rcdb/python/click/core.py", line 1699, in __init__
    Parameter.__init__(self, param_decls, required=required, **attrs)
TypeError: __init__() got an unexpected keyword argument 'help'

The error is in one of the decorators, where it gives a help="" argument
that is not supported by the Parameter class constructor. It is easy to fix
by adding a help=None to the end of the Parameter constructor argument list
in core.py. Would you like me to submit a pull request for this, or leave
it to you?

-Richard Jones
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