add pure ODD tutorial


git-svn-id: svn+ssh://svn.code.sf.net/p/tei/code/trunk@13079 e5332ce4-a50f-0410-b94b-d658400b0204
added propset comment to top, implemented https://sourceforge.net/p/tei/bugs/281/

git-svn-id: svn+ssh://svn.code.sf.net/p/tei/code/trunk@13080 e5332ce4-a50f-0410-b94b-d658400b0204
add linking module to tei_svg, and check it validates comenius files in Test

git-svn-id: svn+ssh://svn.code.sf.net/p/tei/code/trunk@13081 e5332ce4-a50f-0410-b94b-d658400b0204
adjust urls in example for image

git-svn-id: svn+ssh://svn.code.sf.net/p/tei/code/trunk@13082 e5332ce4-a50f-0410-b94b-d658400b0204
Experimenting with #1

Altered the content model of lem and rdg, and made app a member of model.global.edit.