Preparations for higher resolution timer were made for POSIX and WIN32 platform.

getMicroseconds() function now implements 64-bit microsecond timer from Windows'
		  QueryPerformanceCounter & QueryPerformanceFrequency. POSIX
		  gettimeofday is already in microsecond resolution.
MILLISECONDS is now unsigned long (modular arithmetics 1-x<2^32 returns correct
	     results)
new type MICROSECONDS unsigned long long
getmilliseconds() is now just an wrapper, which does division by 1000 of
	 	  getMicroseconds function result
Typo: ./opener -> ./OpENer