Improved use of INCLUDEOS_SRC in scripts

[mnordsletten]

• Removed a lot of default values where INLUDEOS_SRC was set to $HOME.
• Now all test.py no longer require INCLUDEOS_SRC to be set in order to run. They figure out the path based on the scripts location.
• Makefiles were also updated to figure this out on their own. Makefiles till require you to be in the same directory to run them.

There are still some smaller dependencies on INCLUDEOS_SRC in some installation scripts. I will get to those later.

I still advice INCLUDEOS_SRC to be set if not installing to the default location ($HOME)

[mnordsletten]

Test please