different kinds of Cache Plugins.
This API change allows developer to create complex cache structures which
can contain arbitrary set of Cache Plugins and / or Cache Bags (Cache Factory).
Extend Cache Factory so it can return RAM based Cache Plugin instance by its Uid.
Fix tests to reflect changes.

contain Cache Plugins.
Unify in one function cache factory uid generation.

Really use memcached backend for testIngestionWithFlare (it was not setup properly).

Add back wrongly removed volatile conversion caching.
Use new set / get Cache bag API.

Fix tests (DMS) to use by default Cache Bags.
Fix some dead code and clean up.
Move cache initialization away from DMS into Cache Factory.

Add Cache Bag which is a specialized type of Cache Factory able to support multi layer caching (through Cache Plugin).

Conflicts:
	bt5/erp5_dms_conversion_catalog/SkinTemplateItem/portal_skins/erp5_dms_conversion_catalog/WebPage_preConvertReferencedImageList.xml
	bt5/erp5_dms_conversion_catalog/bt/revision
	product/ERP5OOo/tests/testDmsWithPreConversion.py

use by using "self" on transactional_cached decorator breaks ERP5Site creation due aq_base.

  If the list of bt5 is huge same dependencies are
  calculated several types due recursivity at the
  same transaction making this method useless

change the style of RATE to percentage and add the price_renderer to control the length of the price

This fixes a regression introduced in
commit f36260d2
("Code clean up in ListBox & EditorField").

Make sure convert is not called in case resource is not convertible.

  - Simplify the code and Minor Optimization for sort

  - Now getDependencyList returns entire list of dependencies even
    if it is already installed.

Follow up changes:
  - Included erp5_full_text_myisam_catalog (dependency of erp5_base)
  - Reimplement sortBusinessTemplates for the new behaviour

This is a follow up change of 63c1f78

- when upgradeSite is called, it will delete orphaned bt is we set
  delete_orphaned to true
- when there is provider calculation in the dependency list, look
  at both installed bt and to all the dependency tree

* fix the state of bt (new, old, present)
* make resolveBusinessTemplateListDependency returning all
  dependencies, even installed ones
* add upgradeSite method to install everything from top level bt
* the code to check version restriction has been removed but
  it should be  moved to another method

Split Discussion Thread reference generator into a separate testable method. Be more strict in generated reference.

Add fieldset class selector which can be used to override fault one when customizing forum's appearance.

'display_list' is also useful at pre conversion level scripts (it allows specify multiple displays for a conversion at once)

Allow pre conversion to happen on any ERP5 Web Page's content  which include relative images (through <img> tags).

This helps writing workflow script because 'listbox' dict does not contain
uids, which makes global 'uids' request value unusable.