Make expr.Eval faster (#775)

* Make expr.Eval faster

* Add bench_call_test.go

* Make parser config optional

Fix parsing of variable declaration nodes combined with sequence node (…

…#773)

Fixes #772

Code style: remove repeated helper functions

Fix coverage reporting

Add Melrōse to "Who uses Expr?" section

Co-authored-by: Anton Medvedev <[email protected]>

Improve now() and date() validation

Remove implicit date's timezone set on parse

Fix printing on conditional/binary nodes

Fixes #613

Revert "Optimize boolean operations between all, any, one, none funct…

…ions (#555)" (#625)

This reverts commit 3c03e59.

Better map ast printing