Updated HTML doc
Unfinished all-interval series example
fn array: unfinished edits
Comments structuring source
Added literal-set-of-int and musing how to fix fn array
Renamed set-of-int to set (same for literal-set-of-int)
fn variable now supports also set vars
Refactoring fn variable (helper fn now in letfn)
Fixed bug: renaming set-of-int into set completed (non-working call to
set-of-int removed and core/set excluded)
Aggregation functions: Doc and comments for limitations or missing fns
added
Aggregation functions: Doc and comments for limitations or missing fns added
fn variable: added test
Minor doc edit
Updated Readme
Updated reference doc
First version of tutorial