tigefa4u projects Trac

Fix typo present in wiki and ticket history templates. Closes #4649.

Minor refactoring of macros, standardize on using ''tag'' instead of ''html''.

!TitleIndex macro: add a `depth` parameter, for not showing pages that are deeper than a given level in the hierarchy.

- `0` means pages at the same level as the given prefix
- `1` means one level deeper than the given prefix (etc. for higher numbers)
- `-1` means any depth

Examples:
{{{
[[TitleIndex(PageTemplates/, depth=0)]]
}}}

This will list the immediate children of PageTemplates (note that "/" was part of the prefix).

{{{
[[TitleIndex(PageTemplates, depth=1)]]
}}}

This will list the immediate children of PageTemplates and PageTemplates itself.

Implements #4653.

In the TracChangeset view, each title of a diff view links to the corresponding restricted changeset, instead of going to the latest revision of that file in the browser.

There are still two other ways to go to the latest revision of that file (from the corresponding '''Files:''' index entry and from the link attached to the newest revision itself, in the diff view itself.

Implements suggestion 2. of #3398.

A batch of minor improvements for the TracTimeline:
- add navigation links (''Previous Period'' / ''Next Period''), with the ''period'' corresponding to the number of days back. Fixes #215.
- show ''Today'' and ''Yesterday'' annotations for the corresponding days. Fixes #2676.
- make the preferences box a bit narrower. Fixes #1013.

Oops, revert debug code that accidently slipped in r4679...

Refactoring of r4677 and take into account special plural of ''copy''

Fix the ''View changes'' form, for files containing the '@' character. Also, normalize changeset.py on using tag instead of html.

In TracTimeline, show the common location for the file entries of changeset events.

This is a follow-up of what r4676 did for the TracChangeset view itself.

The existing TracIni setting `changeset_show_files` is reused:
{{{
[timeline]
changeset_show_files = location
}}}

Implements #3274.

In TracChangeset, show the common location for the file entries.

This will be quite useful for those having deep paths in their repositories, as usually changesets happen below some specific folder in the repository only.
That folder will now be shown as the '''Location:''', and the '''Files:''' section will only contain the paths relative to that Location.

Implements #3549.