tigefa4u projects Trac

WikiRename: add a simple user interface for renaming wiki pages.

The interface was modeled after the one for deleting wiki pages, i.e. with a confirmation page that asks for the additional details.

WikiRename: add a method to the model for renaming a wiki page in-place.

New methods:
- `WikiPage.rename(self, new_name, db=None)`
- `Attachment.reparent_all(cls, env, old_realm, old_id, new_realm, new_id, db)`

Implementation note for `Attachment.reparent_all`: we move files individually instead of the whole folder, because:
1. this will work even if the new resource already exists (e.g. for merges)
2. it's complex when the new resource is a sub-folder if the old one
3. it's simply not possible in the general case (e.g. when the new page doesn'titself exist, but there are already sub-folders)

Note also that it's because of 3. (sub-folders may exists) that we don't remove the old attachment folder after the reparent.

WikiRename: simplify transaction handling in the Wiki model

The !WikiPage public API is not modified. A helper `transaction` function is used to factor out the `handle_ta` business. Its usage is very simple:
- if the function is given a database connection, it will simply execute the callback as part of another transaction,
- if the function has to retrieve a new database connection, it takes responsibility to either `commit` the changes performed by the callback or to `rollback` them, if any exception was raised.

TODO: similar changes could apply to `trac.ticket.model`

Branching WikiRename for implementing #1106

A few clean-ups:
- remove unused variable in wiki/model.py
- typo in wiki_delete.html template

SpamFilter: Fixing a minor glitch with title attributes. Closes #4941.

Small visual fix for label of Inter* links. When used as `[trac🎫1]` it did not show the prefix of 'trac', whereas `trac🎫1` (no brackets) did. Now they both do.

0.10.5dev: ported r6415 (''vc cache fix for postgresql 8.3'')

Adapt version control's cache to PostgreSQL 8.3. A few explicit casts of the revision to a str were missing.

Closes #6274.

Testing: merge through r6137, except r6120 and r6122. All tests pass.