Use L macro for local libraries in Makefile
Fix testsuite to take into account current paths
Use realpath for determining the canonical name of a file
Add preload library to mock a directory, such that paths in the testsuite
are always the same, regardless of the location of the testsuite
Make mock dir configurable at runtime
Add start-up and clean-up code to mockdir
Add copyright notices to mockdir files
Added automated test
Use realpath(getenv) instead of getenv for base_dir
Just initialize all mock_dir functions on library init
Update first test to the new mockdir environment
Fix all tests to use the new mockdir framework