* add support for Drude Mie coefficients
* adjust tests
* add configuration file for doxygen
* add make doc
* add documentation
* support drude model for sphere (untested)
* use a more clever Makefile
* make clean and doc PHONY
* add documentation
* remove argument lmax from function casimir_mie_cache_alloc
* add doc/ and *o to .gitignore
* add documentation
* add documentation
* rename a function
make Mie coefficients for Drude metals work
add first test for Mie coefficient for Drude metals
* adjust header
* add more tests
wip
* enable tests again
* show relative difference