Previously a new list marker would get added when working within a code
block that was part of a list. This change excludes code blocks from
list marker creation.
This change ensures the syntax is properly changed when running multiple
tests by removing the previously created temporary wiki and then
creating a new one.
The functions stopped at the end/start block marker (respectively)
instead of returning the following line. This caused issues when the
function was subsequently called in markdown mode since the start and
end block markers are the same.
This fixes#407
