Add flag NO_MODULE_LIBRARY to dune_add_library

Summary

Add the flag NO_MODULE_LIBRARY to the cmake function dune_add_library. If this option is set, the created library is not added to the global property list DUNE_MODULE_LIBRARIES and thus not automatically linked when dune_enable_all_packages (or a similar macro) is invoked.

Application

This option is useful if you want to create libraries in a dune modules that should be automatically exported but not automatically linked against. An example is the alberta libraries that are created for multiple dimensions and not all should be linked simultaneously but only on request of a specific dimension.