pcp

pmie_daily - assorted minor fixups

• handling of realpath equivalent in _unsymlink_path() was not strictly correct, and failed on Mac OS X where /tmp is really a symlink to /private/tmp
• the test for existence of a process used /proc/pinfo/ or /proc/ ... the exit status from ps -p is a much more portable way to do this
• improved diagnostics with -VV to help track matching running processes against the control file and the contents of $PCP_TMP_DIR/pmie