authormap: only append new or changed authors Previously, specifying an extra authormap with the hgsubversion.authormap configuration variable would cause the entirety of the other authormap to be appended to the one in '.hg/svn/authors' on each subversion access (e.g. hg in/out/pull/push). This also changes the authormap to preserve comments and the like in the authormap file.

include Makefile *.rst
recursive-include tests *.py *.sh *.svndump *.txt