This release resolves issue#2 and updates SheafSystemTest for compatibility with SheafSystem v5.0.0.
Also fixes an unreported error in the build system involving an ambiguity in the definition of the CMake configuration variable PREREQ_SHEAFSYSTEM_HOME, which has been replaced with the more precise variable PREREQ_SHEAFSYSTEM_CONFIG_DIR. See README for details of setting this variable during build.
Also modifies the behavior of the check target in the build system so that it always runs the tests, not just the first time it is invoked.