Vers. 0.21      2011-Jan-26
        - Placed second argument on ftok call at POSIX.pm 

Vers. 0.20      2011-Jan-19             A. Douitsis
        - Fixed 03multiproc.t. When forking, inherited flock was the same for all child and parent. Re-opening file after fork  fixes that bug.
        - Fixed semaphore exhaustion after several tests. Removed IPC_PRIVATE, now using ftok and a (real,readable) file to generate unique semid

Vers. 0.14      2007-Oct-31             A. Douitsis
        - Changes involving mmap with MAP_ANON on POSIX

Vers. 0.13      2007-Aug-11             D. Arnold

        - disable write-only tests for OS X aka 'darwin' and other
                BSD derivatives

Vers. 0.12      2006-Aug-14             D. Arnold

        - removed threads dependencies in test suite

Vers. 0.11      2006-Apr-23             D. Arnold

        - added getAddress() method
        - cleaned up XS code
        - merged POSIX.xs into Mmap.xs

Vers. 0.10      2006-Apr-14             D. Arnold
        Coded.