header downsizes for a smaller example and beamformer adjusts magic
numbers for setting up dimensions to support that.

init method setups up the weights instead of only being loaded by a
file, this makes `cublas_main` unusable but this is for setting up to
verify output and be able to start making adjustments

`testbeam` was meant to be `multibeam`. the new testbench sets up data
using the time dimension as scanning angle to plot beam patterns. So
each time element is an angle. beamformer weights are ULA and the angles
chosen split up the number of beams. All the same data is in each
channel

couldn't compile for cuda 11 using complex, needed to move to cuComplex

change formatting of code

start to adjust header definition for alpaca but ended up more with
todo's and notes to try and understand what to do in moving from flag to
onr to alpaca and be more flexible/standalone

flag beamformer library has always been part of a larger project, this
strips that down to a separate repo and removing much of the other
baggage

additionally, a lot of changes have been made to adjust flag to onr but
we need now need the beamformer to look more like flag and there was no
tag or real commit to revert back