Makes "future imports" and Python version comments consistent.

This makes the "future import" statements consistently specify
absolute_import, print_function, and division, for maximum consistency
between Python 2 and Python 3.  Although absolute_import is probably a
don't care for top-level programs, if unit tests were ever implemented
for the programs they would be imported as modules, making the module
import behavior relevant.

Note that previous Python 3 fixes are a prerequisite for this change.

Also makes the "polyglot comment" consistent across sources.

TESTED:
Using a version of SConstruct patched to use the target Python for
build helpers, ran "scons build-all check valgrind-audit
www/hardware.html" with all six supported Python versions.  Also ran
gegps, gpscat, gpsprof, xgps, and xgpsspeed with both Python 2 and
Python 3.

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