adaptions to Windows: readline(), added sleep_win()

[Thomas008]

readline(): offset for fseek must be 2
sleep_win(): usleep does not work. used function Sleep() for Windows

[brenhinkeller]

I assume the test failures aren't from these changes? If so we can probably merge anyways

[Thomas008]

Yes, the code runs in my system. Hopefully you can check it.
The only problem that might occur is to run the function sleep_win() in Linux. Probably it would better to have one sleep-function that decides with Sys.iswindows() which function to take, usleep() or sleep_win(). But usleep() takes mikrosecends as parameter, while I'd prefer seconds (exact to miilliseconds) as in sleep_win().