Created dbpa.py as a copy of f32.py for now

not working, but allows me to track changes that I make all the way back to start
made initial import for DBPA format (untested)
BF: DBPA is now importing data from file correctly into memorymap object

i.e. shape is correct and data have sensible values
Merge branch 'master' of https://github.com/peircej/eegpy into develop

New file format implementation.
Completed integration of DBPA format

Complete refactoring: DBPA and F32 now inherit from the same
baseclass, MemoryMappedBinaryDataFile. Code redundancy is minimal.

Also, a new base class for filtered reading is created, and both
F32filtered and DBPAfiltered inherit from it.