waggle: Adding alias for action('t', arg) transform(arg) and transformAll(arg).
waggle: Moving Waggle documentation into source tree.
predicate/reference.md: Add missing documentation on flatten.
predicate/standard_valuelist: Add focus.
predicate/standard_string: Add stringReplaceRx. RNS-768
predicate/reference.html: Update to latest version of reference.md
engine/var.c: Expands now output "NULL" for null bytestrings rather than assert failing. RNS-787