Move DropBox files into a src directory.
Modify build to copy from src.
flake8: fix fsAbstractPlatformMonitor
flake8: fix fsDirectory
flake8: fix fsDropBox
flake8: fix fsDropBoxMonitorClient
flake8: fix fsFileServer
flake8: fix fsLists
flake8: fix fsMac-10-5-Monitor
flake8: fix fsMonitor
flake8: fix fsMonitorServer
flake8: fix fsNotificationScheduler
flake8: fix fsPyinotifyMonitor
flake8: fix fsServerFS
flake8: fix fsServerMS
flake8: fix fsUtil
flake8: fix fsWin-XP-Monitor
Explicitly copy omero_version.py to python lib from OmeroPy

Previously this file was copied as part of the OmeroFS source
files and was a side-effect of the original flat directory
structure there.
Modify setup.py to require pytest.
flake8 OmeroFS/src