* some of the keywords are now prepended with '@'; all the words starting with '@' are now reserved for various attributes, not to pollute the common "namespace" of reserved words:
parallel -> @parallel, pure -> @pure, nothrow -> @nothrow, static -> @Private, ccode -> @ccode, object -> @object.
"inline" was removed (probably later on @inline and maybe @non_inline will be added).
@unzip was added to indicate unzipped array comprehensions (not implemented yet).
@DaTa was added as a keyword to embed datafiles into the generated .c files, e.g. `val default_font_data = @DaTa "rubik.ttf"` (but it's not implemented yet either).

* added 2 special kinds of fold loop: all & any

fold ok=true for i <- l {if !predicate(i) {break with false}; ok}  ===> all(for i <- l {predicate(i)})
fold ok=false for i <- l {if predicate(i) {break with true}; ok}  ===> any(for i <- l {predicate(i)})

later on find and find_opt will be added.

* the body of for loop (including folding and comprehensions cases) can now be a pattern-matching body:
    for month <- months { match month { July | August => rest() | _ => work() } }
    can now be replaced with
    for _ <- months { | July | August => rest() | _ => work() }
    // note that the 'month' variable is not explicitly used and thus can be replaced with '_'

* [K|C]ExpBinOp, [K|C]ExpUnOp were renamed to easier-to-type and easier-to-read read [K|C]ExpBinary and [K|C]ExpUnary, respetively.