parsenum not private
lstart lend -> astart/bastart aend

arrays have a different connotation than lists
dict_entry field generalized
implement bastart and aend
stray newline, fixed
add support for byte-arrays
add support for parsing words
fix _find
warn if no stack effect, but support
introduce $mfactor_sources compile-time var

if non-empty, include more mfactor files in compilation,
not only stdlib.mfactor