Changes class name for PEP8 naming convention
changed hard coded buffer size to configurable BUFFER. Default 65536
added size attribute to BUGFile
added else part of attribute declaration
put buffer configuration into file modle where it is needed
added some documentation
nothing important
fixing error during BUGFile __init__
minor changes.
Issue https://github.com/phasezero/backUgo/issues/1 done