XWIKI-9905: Fix the list of members for subwikis

* Add "xwiki:" in front of every member of the list if it's not already there
XWIKI-9868: Allow continuing in wikis default UI step without having upgraded all wikis
XWIKI-9782: New Crypto Service API

- Minor refactoring.
- Allow usage of String for passwords
XWIKI-9782: New Crypto Service API

- Remove unsupported asymmetric key algorithm
XWIKI-9905: Fix the foreach loop

* Insert the line of adding member in a map into the foreach loop
Fix typo
XWIKI-9907: NullPointerException on $services.wiki.getById() when getXObjects() returns a list with a null element.
XWIKI-9868: Allow continuing in wikis default UI step without having upgraded all wikis
* Update step summary.
XWIKI-9908: Improve the label of the Distribution Wizard step buttons
* Replace 'Skip' with 'Later' and 'Cancel' with 'Never'.
* Update the step button hints
* Make sure the user doesn't cancel the DW by mistake by asking for a confirmation.
 XWIKI-9687: Better sheet for XWikiServerClass.

 * The last one had problems such as:
 **  XWIKI-9881: Error when editing section on wiki descriptor page
 **  XWIKI-9828: $objTemplate.get("iswikitemplate") displayed in wiki descriptor
 * This new one add some translation keys to explain what a descriptor is (and what an alias is)
 * It also add a link to the wiki administration page
 * The code avoid HTML except when I was not able to do without it and I believe it is more clear
XWIKI-9858: Unexpected behavior of "back to list" button after adding an extension
 XWIKI-9687: Better sheet for XWikiServerClass.

 * The last one had problems such as:
 **  XWIKI-9881: Error when editing section on wiki descriptor page
 **  XWIKI-9828: $objTemplate.get("iswikitemplate") displayed in wiki descriptor
 * Now uses the forms standards (http://platform.xwiki.org/xwiki/bin/view/DevGuide/VerticalForms).
 * Fix xHTML validation.
XWIKI-9707: org.xwiki.wiki.manager.WikiManagerException: wiki id is not valid.

* Add a message to explain that DW will be started just after the wiki is created.
 XWIKI-9687: Better sheet for XWikiServerClass.

 * The last one had problems such as:
 **  XWIKI-9881: Error when editing section on wiki descriptor page
 **  XWIKI-9828: $objTemplate.get("iswikitemplate") displayed in wiki descriptor
 * Fix translations.
XWIKI-9782: New Crypto Service API

- Fix a typo
XWIKI-9782: New Crypto Service API

- Fix wrong test package
XWIKI-9782: New Crypto Service API

- Add private key encryptor for easy management of private key encryption and decryption using password based ciphers.
- Improve PBES2 parameters to support custom random source
- Improve KeyWithIVParameters to better support custom random source
XWIKI-9579: Add a Distribution Step for showing a report of the changes brought to the wiki with full diffs
* first version with
** tree of all the modified documents
** possibility to revert or delete a document

No diffs yet.
XWIKI-9912: Cannot repair the main wiki UI any more with the Distribution Wizard
* Fix injection.
Merge pull request #256 from woshilapin/XWIKI-9905

XWIKI-9905: Fix the list of members for subwikis.