Log Message:
Update to 0.3.1. Closes PR pkg/23084.

Changes for 0.3.1:

    * fix 32Bit signed/unsigned bug
    * improve Linux /proc/net/dev parsing
    * disable LED (set -DWITH_LED to enable them)
    * make slurm Gbit-safe (tests with >100MByte/s will be done soon :))
    * make -Wall happy on all systems
    * calculate traffic correctly when using -d option
    * add Mac OS X support (thanks Jan-Eric Kolbe for providing access!)
    * print usage information if no interface was given at startup

Changes for 0.3.0:

    * did some profiling and lowered cpu usage of sleep stuff
    * misc small fixes and documentation updates

Changes for 0.3.0-pre1:

    * theme support
    * misc small typo fixes and internal changes

Changes for 0.2.3:

    * Solaris interface speed detection code
    * fix visual overflows in the display when running for long time
    * prevent the missing 'E' from being overwritten

Changes for 0.2.2:

    * Solaris auto* support
    * -z option to virtualy reset displayed counters
    * fix padding problems which lead to speeds like 123.45KB/s/s/s/s