Fluxgate measurement code

###fluxcouch.py

uses pynedm to listen to command documents in nedm/Fluxgate and executes the start/stop command when a document is found. Start and Stop functions also post status documents with runstatus set to 1 and 0 respectively.

###control.py

provides functions that post command documents that fluxcouch listens for

###ADSpythonmodule

c++ code to provide a python module to read out ADS USB 4716. Needs installed device driver from [advantech homepage] (http://support.advantech.com.tw/Support/SearchResult.aspx?keyword=USB-4716&searchtabs=BIOS,Certificate,Datasheet,Driver,Firmware,Manual,Online%20Training,Specification,Utility,FAQ,Installation,Software%20API,Software%20API%20Manual&select_tab=Driver)