always return carry
asm version of preInv
remove warning
auto assign register for op
add test for toStr16
add toStr2 without gmp
break backword compatibility ; don't add 0x at default
string test for a string having space
remove assert for pn_ == 2
remove warning in assert
Merge branch 'master' into refactor_io
separate hasIO ; add test of io
add toStr test
always use hex string
Merge branch 'refactor_io', remote-tracking branch 'origin'
Merge branch 'master' of github.com:herumi/mie
align for loop
break backward compatibility ; throw exception if base conflicts with prefix