plus a few python3 fixes for problem that appeared now that we have more test coverage

See merge request !1128

and a few cleanups in test suite

See merge request !1126

This removes some logs happening a lot during tests, when installing business templates or indexing documents.

See merge request !1105

Updater was using this command to find the latest revision modifying a
path:

  git log -1 -- $PATH

but because of git log's history simplificiation [1] when the head of
the branch is a merge commit, the considered revision was not the merge
commit but its parent.

Use --full-history so that git does not simplify history and return the
merge commit if the latest commit is a merge.

[1]: https://git-scm.com/docs/git-log#_history_simplification

See also https://stackoverflow.com/a/50724301/7607763

instead of randomly truncating the existing file, which sometimes does
not cause an invalid index, create an invalid index from scratch.

I used this blog post
https://mincong.io/2018/04/28/git-index/#2-inside-gitindex for a
description of the index format.

See merge request !1123

These tests are calling runUnitTest twice, first to save then to run
test. On the second run the directory is already created.

Causing the browser time to be used instead of the calculated time of the server, which was incoherent with previous behavior (fix 5c4a03f6)

Display the timezone (if the field is configured like that) in both editable and non-editable mode

See merge request !1113

Using the test class name was causing conflicts on some test classes.
CodingStyleTest was a case, all test use CodingStyleTest class with an
environment variable to control which business template is tested. In
this case, we want one log directory for each business template.

Introduce a getLogDirectoryPath method that's supposed to create and
return the path of the directory to use for log and override this method
for the special case of coding style test.

This test will guarantee that the issue of PyPdf2 overwrite warnings.showwarning method. By default, overwriteWarnings is True in PyPdf2 and we don't want change in many place in ERP5.

Then, this issue should be fixed in PyPdf2 package.

As header h* and link a use the same color, keep the underline to differenciate links

See merge request !1120

Now that .spawn is called in tests, we can see that
getSupportedParameterList needs to take into account that on python3 the
program output is captured as bytes.

These logs are public and the URL can include credentials.

Fixes #20200514-E3304

we don't want to patch spawn for all tests

Substitution mapping can be used on the web section default document to include a list of documents.

The documents will match the web section predicates and a category defined on the web section layout configuration parameter.

The substitution key will look like: ${basecategory[__parentcategory]__category}

IN non-editable mode the timezone was never shown even if the field was configured to display it.

Drop appcache use in all OfficeJS application

See merge request !1091

To benefit from activity deduplication.
This may also improve same-processing-node behaviour when
SQLDict is crowded while SQLQueue is not, making these activities
behaviour more consistent with non-fulltext catalog indexation activities.

fix also can't get parameter thought request for current url format

- web site modification date is used as etag value for caching purposes
- add 304 response status support

- image editor
- web table editor

- text editor
- spreadsheet editor
- presentation editor

- Text editor
- Svg editor
- Codemirror editor
- Pdf viewer
- Bookmark manager
- Media Player
- Smart Assistant
- Drive App

- new storage to handle precache manifests instead of appcache