Fix an inexplicable bug in testilfter.py.

All regression tests pass.
ake an error message less obscure. All regression tests pass.
Typo fixes.
Work around Apple's apparent failure to implement clock_gettime().

From code by dak180. All regression tests pass.
Pacify plint & Coverity.  All regression tests pass.
Attempt at shutting up OS X. Regression tests pass (under Lnux).
Bloom filtering is gone.
Yet another try at shutting up OS X's compiler.