v6.0.1

Minor updates:

1. Doxygen cleanup
2. Fix memory leak in ILU routines
3. Clean up some f2c-ed files

What's Changed

• C99 compatibility fixes by @gruenich in #82
• Reduce warnings and fix bugs in ?readrhs by @gruenich in #83
• Fix many clang warnings by @gruenich in #84
• CMake: Enable Doxygen by @gruenich in #86
• Improve Doxygen for TESTING/ by @gruenich in #89
• [doxygen] Include modules.txt and mainpage.txt in DoxyConfig by @gruenich in #92
• Doxygen module for examples by @gruenich in #95
• testing/matgen: reduce use of f2c.h by @gruenich in #93
• [cmake] Alter way of handling enable_doc by @gruenich in #94
• Remove f2c.h from TESTING by @gruenich in #96
• Build examples with CMake by @gruenich in #98
• Improve code in example/ by @gruenich in #97
• Improve Fortran with CMake by @gruenich in #99
• Adjust forward delcaration of float/double Malloc/Calloc by @gruenich in #100
• [cmake] Fix Doxygen call by @gruenich in #102
• Remove unused header unistd.h from tests and examples by @gruenich in #109
• Cleanup TESTING to use more headers by @gruenich in #103

Full Changelog: v6.0.0...v6.0.1