- various other improvements to the docs 

Better fail check in EvaluatorFilter

Updated the assembly file

ongoing work

moving manual/images

ongoing work on the documentaiton

Moved all html docs in a "pages" directory. They are now filtered to display values of variables like ${project.version}.
The site.css and print.css files have also been moved to allow a more comfortable edition of the html docs.

doc improvements

doc updates

 - Removed org.slf4j.LoggerFactory and migrated ContextSelector related initialization code
   to org.slf4j.impl.StaticLoggerBinder

 - Minor adjustments in test cases

doc updates

reverting to previous config of retrotranslator plugin