- wrap long line

"from blah import (foo, bar
baz, bongo)"

ldexp.  Both methods are exact, and return the same results.  Turns out
multiplication is a few (but just a few) percent faster on my box.
They're both significantly faster than using struct with a Q format
to convert bytes to a 64-bit long (struct.unpack() appears to lose due
to the tuple creation/teardown overhead), and calling _hexlify is
significantly faster than doing bytes.encode('hex').  So we appear to
have hit a local minimum (wrt speed) here.

components without division and without roundoff error for properly
sized mantissas (i.e. on systems with 53 or more mantissa bits per
float).  Eliminates the previous implementation's rounding bias as
aptly demonstrated by Tim Peters.

system, exploit cmd.exe's setlocal function in this directory.

Replaced outcomes from native Tcl/Tk tests.  Maybe the diffs are legit,
maybe not.  I noticed that the Tcl results I'm replacing here claimed
both that there were no failures, and that one file had tests with
failures, so I wasn't inclined to trust them <wink>.