refactor select-with-prebounds to avoid lazyseqs & use transient accu, rename into select-with-bindings, remove old, refactor unbound-vars-translator, update select-join
refactor bind-translator to return optimized transform fns directly, update select-with-bindings to avoid use of select-renamed-keys
remove obsolete result set helpers, rename make-qvar into auto-qvar
add support for pre-bound qvars via :with query option, update related compiler fns, bugfix accumulate-result-vars to always return value sets, update select-join to keep prebound bindings intact