More precise network speed detection

On 1 GBit network it is possible to receive speed <1ms for 64000B of PING size.
This speed were not parsed correctly so no speed was shown.
Also TIME value was set as INTEGER where e.g. 5/3 returns 1 instead of 1.6666666 so counted speed should be more precise now with DOUBLE format.
Anyway speed test is still quite inaccurate because <1ms gives 1GBit and =1ms gives 512Mbit....but better anything than nothing:-)