6.0.1

This is a patched version of 6.0.0 to clean up deployment issues.

Added

• Enable debugging of CMake includes with USE_DEBUG_PRINT=ON
• Add fake HTMLSummary target to be compatible with older make libraries

Changed

• Use the env var CC if present to have priority over the compiler found in
  the PATH environment variable. This is needed because conda defines a new name
  for the compiler (x86_64-conda_cos6-linux-gnu-cc). This change allows the
  correct parsing of the compiler version and its use for the compiler flags switching.

Fixed

• Cure ill-formed grep tests that were causing a test timeout.