TINY-631: constrain toc_depth to 1-9 range only
TINY-631: constrain toc_depth to 1-9 range only

jtark/tinymce,adaptiffdesigns/tinymce,MediehusetTek/tinymce,jtark/tinymce,FernCreek/tinymce,ikuchmin/tinymce,danielpunkass/tinymce,blakewallan/tinymce,FernCreek/tinymce,ETSI-CTI/TinySpecMCE,tinymce/tinymce,ikuchmin/tinymce,leofeyer/tinymce,danielpunkass/tinymce,aduth/tinymce,fillabs/TinySpecMCE,blakewallan/tinymce,aduth/tinymce,tinymce/tinymce,gencer/tinymce,rbecheras/tinymce,leofeyer/tinymce,MediehusetTek/tinymce,adaptiffdesigns/tinymce,TeamupCom/tinymce,TeamupCom/tinymce,ETSI-CTI/TinySpecMCE,tinymce/tinymce,rbecheras/tinymce,FernCreek/tinymce,danielpunkass/tinymce,fillabs/TinySpecMCE,gencer/tinymce