improve license notice

supposedly handle >1000hz

From
https://gist.github.com/Sporif/314d5796e48ff0e9f63ec5b89f967b66
I don't have a > 1000hz mouse to be sure.

Increase event max, someone has event257

remove last testing date, code is stable

Use proper 64-bit integer arithmetic for Hz calculation

The current code uses double floats, which makes no sense since
time differences are always integer and never fractional.

Also fix up the averaging code a bit.

This fixes some spurious wrong Hz values reported for
my Logitech Rumblepad 2.

Signed-off-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>

small doc update

general improvements

add uhci_hcd bug to README.md

minor: doc format

update readme

lessen indent, use spaces

Merge pull request #4 from aldrik/master

Show the polling rate for graphics tables

Also show the polling rate for graphics tables

minor doc update

minor doc update

doc update

minor doc update

doc update

fix handlig of string /dev/input/event[10..49]

Minor readme update