module for detection of binary versus text in strings

 The Data::Binary module provides string equivalents to the -T / -B operators.
 Since these only work on file names and file handles, this module provides
 the same functions but on strings.
 .
 Note that the actual implementation is currently different, basically because
 the -T / -B functions are in C/XS, and this module is written in pure Perl.
 For now, anyway.