* include/sys/param.h (NBBY): Define if not defined.
* include/sys/param.h (setbit): Add new bitmap related macro.
(clrbit): Likewise.
(isset): Likewise.
(isclr): Likewise.
(howmany): Add new counting/rounding macro.
(rounddown): Likewise.
(roundup): Likewise.
(roundup2): Likewise.
(powerof2): Likewise
(MIN): Add macro for calculating min.
(MAX): Add macro for calculating max.