Log Message:
Update to 0.91:

libstatgrab 0.91 (11 July 2014)
 * Use /proc/mounts on Linux where available. Note that this
   potentially results in different data appearing in the filesystem
   statistics. To override the choice use the --with-mnttab configure
   flag.
 * Add a new field named device_canonical to the filesystem statistics.
   This always holds the real device and is useful in the case where
   device_name is a symlink.
 * Fix list miscounting in sg_set_valid_filesystems.
 * Fix buffer overrun when dealing with a larger number of processes.
 * Fix divide by zero display problem in saidar.
 * Building of examples is now disabled by default. Use the
   --enable-examples configure flag to build them if required.
 * Logging (log4cplus) is now only enabled if the --enable-logging
   configure flag is given.
 * When logging with log4cplus is enabled, properties files are
   installed in to ${prefix}/etc. Both statgrab and saidar will search
   this location when starting up. These files can be used to
   configure the behaviour of log4cplus.
 * Add Graphite output support in statgrab.
     (Thanks to John Lyman)
 * Fix test suite problem when doing a VPATH build.
 * Install distribution documentation (such as this file) in to
   ${prefix}/share/doc/libstatgrab.
 * Various other minor bug fixes identified by compiler warnings.
 * Update code for the Windows platform. This is incomplete, but we
   included the changes to give anyone else working in this area a
   better starting point. We welcome pull requests to further improve
   this code. The original pull request can be found in #36.
     (Thanks to Brent Cook)