This merge request is trying to provide an API so that we can construct urls in a more organised manner than manipulating strings.

The motivation, started from this merge request: !333, where absolute_url is overriden for Web Section and Web Site. Then we found that we have to do many dirty changes like:
```
              absolute_url python: here.absolute_url();
              absolute_url python: absolute_url[:-1] if absolute_url.endswith('/') else absolute_url;
```
(more of those in f601d7a5).

So we said we should make an API to have an organised manner, like we have e.g. Base_redirect to handle redirects.

- First commit adds this as a script in erp5_core, along with a test.
- Second commit uses it. It is not on my scope to change all erp5 code, but I focused on changing on the things I already had to in
f601d7a5

@romain , @kazuhiko please make comments. Tests passed, but not on the final revision (did some amendments) and I think better not to re-run suite  before getting comments. Also, @tatuya , I think you are responsible for ERP5 interfaces, so I would like your opinion if erp5_core is the good place, or maybe some other BT or product.

My plan would be to merge this and then !333 rebased on this. But in any-way this should be separate from !333.

/reviewed-on !431

Use Jio 3.26.0 in erp5_web_renderjs_ui and  erp5_core

/reviewed-on nexedi/erp5!491

/reviewed-on !490

fix attachment parallel synchronization issue

inotifyx is has no support for Python 3 and
it does not seem to be maintained anymore.

/reviewed-on !484

The erp5 site creation fails due to a dependency error. Dependency to erp5_full_text_myisam_catalog was added to the erp5_scalability_test business template.

/reviewed-on !483

fast synchro is not ready.

Note:
This is not a complete work, i.e. it is not supposed to update all url
calculations of generic ERP5. It is done so that:
- Other pending work can use it
- Demonstrate how the API should be used and test it

for a base document, given the form_id, document_reference and GET parameters

Commit contains also a test in testERP5Type

Allow to overwrite this inside project to init Properties like reference.

Because it is mainly used from the 'initsite' zope.conf section, the passed
value is often a string, hence the automatic cast to integer.

The default is defined in erp5_core: 1
The specific value '0' disables storage in ZODB.
Another other value sets the interval.

- Use unrestricted _edit method on reportTaskStatus - restrictedTraverse applies security anyway
- Remove some useless code
- Fix TypeError: stopUnitTest() takes exactly 3 arguments (4 given)

In order to use setting in multiple application on same domain.