first step in regexp quantifier rework: make disjunction parsing result a struct to allow more fields to be passed
track capture range saved by an atom
add DUK_REOP_WIPERANGE and implement saved array wiping when quantified is rematched, fixing e.g. test-bug-regexp-quantifier-captures.js
add WIPERANGE to regexp doc
remove nonascii chars from regexp doc
#if 0 out disjunction level start/end captures field, which was not needed for quantifier capture handling after all
makefile debug level trivia (revert accidental previous debug level increase)