This reverts commit f0023bef.

Luke went to overcomplex idea to solve simple problems. In order to avoid
exposing bad ideas, commit gets reverted.

Make sure no more than set in preferences authentication failures are
saved.
Redirect to 'Update Credentials' form if after successful login password
is to expire soon.

saved. Add comment.

This method was refactored to:
 - automatically resolve and install business templates dependencies if requested.
 - Make possible use activities and prevent long transactions.

This method comes from previous Implementation.

Due the presence of object_to_update, the API will never update the catalog
if we do not provide explicitly values.

The API resolveBusinessTemplateListDependency is able to return a list
of BT5 with URL and include all dependencies.

This introduces flexibility, and permit this method be reused in
different ways.

Business Template API itself should detect if update catalog is mandatory
or not, instead force never update.

installBusinessTemplatesFromRepositories uses plural, which is a code crime,
Keep it deprecated to preserve backward compatibility.

If Business Template is not present, returns None.

There was several tests specifics to TemplateTool into testBusinessTemplates
This commit move tests to appropriate test suite.

No Contract field shall be rendered, and no need to confirm.

Cover cases of ERP5 portal and Web Site contexts. Use anonymous and check
that returned page contains correct links and that those links are rendered
correctly.

Support classical style and web site style.

Provide new preference, which if set can be used to find portal global
contract document.

954e399c introduced typos.

Provide sensible defaults.