Set up for new tests
Simplify observability using new astropy Angle/Quantity functionality
Add basic lofar folding plus test master
Addition of polyphase filter and its inverse
(from Nijmegen pycr package, via Olaf Wucknitz)
LODAR tests on J1810
Initial setup for testing VLBI with 5 minutes of PSR B1919+21
Merge branch 'master' into fft_openmp
this pulls in Marten's 'trials' directory