Release 0.3.0: Variable name changes

- install: Fix creation of shared library symbolic links
- config: Make COLORIZE a weak variable
- install: Select which kind of files go in package subdirectory
- colorization: Check pipe status
- Set rpath for testing purpose with opt and debug targets
- docs: Udpate README.md to match installation refactoring
- Refactor installation
- Simplify the color filter
- Colorize test results even if at top-level
- Colorize generate steps even when generating makefiles
- colorization: Put colorization of config in COLORIZE