separate AJAX API calls in async.php
rework on interfaces and classes

- added classes
- simplified aggregator class, ajax calls, controller interface
list handles classes instead of arrays
removed the lame zebrabar
fixes on template and lists handling
text reformat
first draft
typos fix
handling as classes
first basic working version

missing article view GET params handling
basic working, by date and by channel
trim aggregated feed only when needed
support for JSON output
various cleanup and fixes
move template handling from aggregator to view
some restructuring