This reverts commit b7d9590c.

Users are not supposed to edit templates because documents are not in their "normal" context, if user edit templates some unexpected things might happen. We don't want user to change state or do some actions that may cause interactions on other documents from a template. This was never strongly enforced, but there was not supposed to be an easy way for users to access the template document.

With old versions of ERP5 (before the rework of isIndexable / isSubTreeIndexable ), users could also add lines inside the template document and these lines where indexable.

Note that the way of editing templates is:

• make a "real" document from the template
• modify this document
• use "Make Template" again - this will replace the document with the same title.