Use Clang as linker too

Signed-off-by: Jonas Kalderstam <jonas@kalderstam.se>
Changed to pattern rules in makefile

And fixed some errors regarding multi-line comments

Signed-off-by: Jonas Kalderstam <jonas@kalderstam.se>
Fixed test printouts to a nicer format

Signed-off-by: Jonas Kalderstam <jonas@kalderstam.se>
SurvLik functions implemented and pass tests

Only question is if the tests themselves are accurate.

Signed-off-by: Jonas Kalderstam <jonas@kalderstam.se>
SurvLikelihood training fixed

All tests pass. Still a question whether the math is entirely correct,
but implementation wise it works.

Signed-off-by: Jonas Kalderstam <jonas@kalderstam.se>