#87 Native Extent Printing

[kfairbanks]

TSK currently prints data addresses under the notion of fixed sized blocks. This works for systems with extents, but is not efficient. It may be better to have a library function that prints extents for file systems that use support them. This raises the question of how extents should be represented.

[starting block] - [ending block],
vs
[starting block] : [run length],

This could be probably be handled in the code for each file system, but maybe a tsk_print_extents function would be bettter.