Documentation issues

[duggabe]

There are three related issues with https://wiki.analog.com/resources/tools-software/linux-software/gnuradio#installing_gnu_radio
A) After the install instructions for libiio, libad9361-iio, and gr-iio it says:

GNURadio will recommend you include
/usr/local/lib${type}/python${PYVER}/site-packages/gnuradio
or
/usr/local/lib${type}/python${PYVER}/dist-packages/gnuradio
in your PYTHONPATH during installation. If this is not the case you will need to modify the cmake command for the gr-iio configuration above with:
cmake -DCMAKE_INSTALL_PREFIX=/usr .

but this needs to be done FIRST.

FYI, a helpful link to set the PYTHONPATH is https://wiki.gnuradio.org/index.php/ModuleNotFoundError#B._Finding_the_Python_library

B) In the "Install GNU Radio and other dependencies", it should be made very clear that gnuradio is lumped in with the dependencies. It would be better to make that two separate items. If a user is not careful, they can end up with two versions of GNU Radio.

C) Pull request #64 changed the install location of the gr-iio files. This results in gnuradio-companion not finding the Industrial I/O blocks. A fix to this problem could be to add the following to the instructions:

edit (or create) ~/.gnuradio/config.conf to include:
[grc]
local_blocks_path=/usr/local/share/gr-iio/grc/blocks

adjusting the path appropriately.