removed integer_length. it makes too many mistakes
clean up things. use tofloat in some rtests
added mext_basic to mext2 and mext3. changed something
that made this neccesary
improve integer_string
add a comment
allow sep->false
put unwind-protect in tofloat
add comment
allow nintegrate to take a function rather than expression
rtests
add comment, add roman_old to integer_string
fix doc.
improve integer_digits
minor reformat
played with some number functions
set-hold-all needed to be wrapped everywhere in eval-when
since code is now compiled then loaded.
add function idivisors
append -> nconc
add function select_index
fix tofloat