specdomain: regexp problem with def macro recognition in docstrings

[jemian]

reported by Christian Schlepuetz

I found the cause of the processing error. It must have something to do
the the regex you use to identify definitions. Line 65 in the header
docstring started with the word "defined". Somehow that triggered the
regexp, which collected everything up to the next "(", which happens to be
on line 69 "(2*AUTO_FILTER_FACTOR)".

I temporarily fixed the problem by moving the word "defined" to the end of
the previous line, but this fluke could potentially arise again. Is there
a way of not searching for any of the function declarations (def, cdef,
reef, global, Š) inside a doctoring? Otherwise, you may have to improve
the regex.

[jemian]

(In [1016]) refs #11, bug noted on list

[jemian]

(In [1017]) fixes #11, always require whitespace after "def" or "rdef" when not a macro function

[jemian]

(In [1019]) refs #11, fold back in additional changes from author