Allow location override for python language binding support files.
Update license date on all files. No functional changes.
Include license updates in more directories; improve directory descent
in root Makefile to avoid errors and loops.
Don't use diff in makefile. Causes make to fail
Ignore return status of 'diff' in make install
Not sure why the 'diff' is in place, but using it as the last step
in make install causes make to say that it failed, causing confusion
for the unsuspecting user.
Under macOS Sierra, the sed -i argument does something differently than editing a script in place.
Forgot to fix library locations in install process
Added makefile to ease installation of Py-bindings
=> Not sure if this works on a Mac