add test to check that the method getInstancePropertyAndBaseCategoryList returns properties from property sheets correctly

Extend method getInstancePropertyAndBaseCategoryList to be possible get property sheets from portal_type objects i.e portal_types/Foo. And refactor code to get properties from object inside portal_property_sheets i.e SimpleItem, DublinCore

Drop a quite bit amount of code duplication on tests and few others
useless copy & paste duplications.

Those tests are fixed but (specially run my docs), the implementation
is a bit poor.

(cherry picked from commit c55d31d748329c08428e6b49ee87556d48201003)

- do not make the test dependent on external web site
  (test was using http://www.erp5.org/dists/snapshot/bt5/)
- do not make the test dependent on generic bt configuration.
  If we change dependency of erp5_base, this will not break
  the test any longer
- use dummy repository for testing purposes

This often happens during reindexation of many objects:
the number of processable grouped messages often exceeds 100
and 1 extra message is reserved for nothing.

This fixes a regression caused by f02bc341
("CMFActivity: automatically reselect messages in 'processing=1' state").

Due the lack of rsvg-convert on current slapos setup, it will make those
tests fail. As soon this become available, those tests will pass.

If the official repository was stuck for some time, of if
the revison of erp5_base was increasing in a too fast way,
this was making this test failing.  Also it would be better
that this test use a fake repository

This merge of "rafael" branch includes several commits for:

  - Fixes for Functional Tests
  - Use Remote URL for Tutorial Related tests (see testFunctionalConfigurator)
  - Fixes for Consulting Configurator Workflow tests
  - Several tests for SVG Conversion and better SVG support

SVG has a special treatment on this case, because is the only format which
is a real image. The others formats are non-image cases.

When it is SVG, rely only on Image API Conversion.

Merged master into rafael branch

Conflicts:
	bt5/erp5_ui_test/bt/revision
	product/ERP5/bootstrap/erp5_core/bt/revision

Person, Organisation, Link person and Organisation and few others tests
were merged with the tutorials, due this some TESTONLY were archived.

This is surely the source of random duplicate uid problems. Indeed,
some test like testERP5Catalog using default extra_sql_connection_string_list
provided by slapos were using same connection string as other running tests

If a TextDocument is used as image (ie.: like in Web Illustration to SVG),
the conversion API should be from Image to prevent code duplications.

Transform the URL into Data URI in order to avoid ImageMagick and
rsvg-convert limitations. This API should be dropped as soon those external
tools can handle remote URLs (ie.: http, https ...) into SVG definitions.

It was included defensive code and a lot of tests to prevent unexpected
outcomes, like raise ConversionError if the download failures and do
not parse empty content.

This way, we can effectively kill all subprocesses. This worked for
slapproxy because Flask calls setsid internally, but slapgrid-* doesn't, so
they wouldn't be killed by killpg.

Fixes upgrade path from older erp5testnode version.