XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.

* Bug fix: canDeleteWiki() was testing if the current script has programming rights, which is not usefull.
Merge pull request #204 from gdelhumeau/master

XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-mananager and xwiki-platform-workspace
* Bug fix: canDeleteWiki() was testing if the current script had programming rights, which is not useful