User:Ans/interleave include tag

source: noinclude includeonly 1 noinclude includeonly 2< /noinclude>noinclude includeonly 3< /includeonly>
 * result: noinclude includeonly 1 noinclude includeonly 2 noinclude includeonly 3

source: &lt;includeonly>includeonly noinclude 1&lt;noinclude>includeonly noinclude 2&lt;/includeonly>includeonly noinclude 3&lt;/noinclude>
 * result: includeonly noinclude 1 includeonly noinclude 2 includeonly noinclude 3