Add nanosecond resolution to file stat functions

Based on Ray Donnelly's idea in ddf7f4ab35002f6eb04094b98127bd8f445512e5
Ensure late calls return correct results

.. the cache expiration would reset to using +0 as
the faketime ignoring the FAKETIME env var.
Define config file parsing related variables in smaller scopes
Do not use -ldl -lm when linking the wrapper
Fix -lrt issues in Makefile
Fix tests on libc 2.17
Fall back to default timer_settime() & timer_gettime() if no versioned version is present
Define CLOCK_MONOTONIC_RAW where it is not present

This fixes compilation on Debian GNU/kFreeBSD
Use SIGUSR1 instead of SIGRTMIN in tests

This will probably fix compilation on Debian GNU/Hurd
fix value for kFreeBSD
Packaging details, starting with OS X
Packaging details, some for Linux
Added installation via Fink on OSX