Removes srcref attributes from Rd objects.
an Rd object
srcref attrbutes (set by
parse_Rd) may be getting in the
way during manipulation of Rd objects, such as comparisons, addition
and replacement of elements. This function removes traverses he
argument and removes the
srcref attribute from all of its elements.
an Rd object with no srcref attributes.
Georgi N. Boshnakov
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