The previous version has supported only files upto 4GiB. When working with
streams of random data (produced with 200MiB/s rate) on stdin this was not
sufficient. This version of program works with 64-bit integers and supports
filesizes upto 2^64 bytes (16EiB - Exbibytes). The offset is now printed as
16 char long hex value.
add -C -A -B option ,function similar to grep

Conflicts:
	bgrep.c