class library: speed improvements in a few places where bit operations are used.

.bitAnd is faster than &
.rightShift faster than >>
etc.

{100000.do{50.bitTest(2);51.bitTest(2);53.bitTest(2);54.bitTest(2)}}.bench //~30% faster
{100000.do{5.asBinaryDigits}}.bench //~60% faster
a= CollStream((0..999)); {1000.do{a.pos= 0; 100.do{a.getInt16}}}.bench //~40% faster
etc.