"username". If encountering a commit made by a user not in the
list, abort.
+ For convenience, this data is saved to $GIT_DIR/svn-authors
+ each time the -A option is provided, and read from that same
+ file each time git-svnimport is run with an existing GIT
+ repository without -A.
+
-m::
Attempt to detect merges based on the commit message. This option
will enable default regexes that try to capture the name source