+ non-scalar example
update (+ unfinished part with a hard profile())
+Pixel example + unfinished part doing a hard profile()
fixing github issue #256 -- along Ben's suggestion
vapply() cosmetics
ensuring that each  check*()  utility  *return* its  warning messages --
unless it stop()s earlier
barnames() using safeDeparse() -- and safeDeparse() used in more places for deparse()
cosmetic reformatting (some examples++)
a bunch of cosmetic and other changes related to previous couple of commits