add support for beaglebone binary peak files
add support for beaglebone binary peak files

The Beaglebone (BBB) POPS produces different format and named binary files
containing peak information. Commit modifies the binary read functions to
handle the data format in the BBB binary files for two different formats.
Has only been tested in the context of a simple program that converts the
binary data to .csv data for use with other analysis programs (e.g., Igor Pro
or Matlab). Needs to be tested within the atmPy framework.

hagne/atm-py,hagne/atm-py