XWIKI-10577: Move wiki.css selectors to colibri.css.

* Remove call to a-non-existing-anymore-file in Flamingo
XWIKI-10622: Failure to get mail sending errors
XWIKI-10623: Mail sending should always work when "from" is not specified and use "admin_email" xproperty instead
XWIKI-10623: Mail sending should always work when "from" is not specified and use "admin_email" xproperty instead
* Generate a warning
XWIKI-10623: Mail sending should use the "admin_email" xproperty instead of "smtp_from"
* Revert changes that were not good

XWIKI-10625: Provide easy access to the Mail Sender API configuration from scripts
XWIKI-10621: Improve the User Profile on phone.
XWIKI-10623: Mail sending should use the "admin_email" xproperty instead of "smtp_from"
* Revert changes that were not good (forgot one)
XWIKI-10627: Failing to compute email subject from a template
+ minor reformating and javadoc improvements
XWIKI-10627: Failing to compute email subject from a template
* Fixed 2 more bugs...
[misc] Apply codestyle
[misc] Apply codestyle
XWIKI-10626: Provide a current wiki based resolver for users and groups reference
[misc] Deprecated XWiki#getRightService()
XWIKI-10622: Failure to get mail sending errors
* Even better fix
XWIKI-10630: Mail Sender's waitTillSent() API should wait till the message is actually sent before returning
XWIKI-10629: Cannot set "from" email address from Velocity when sending an email
[misc] Fix deprecated calls
Fix deprecated calls
[misc] Fix deprecated calls
[misc] Fix deprecated calls