Run ABIN through Valgrind

[danielhollas]

GCC also offers some sanitization options that we might want to enable in the CI.

https://gcc.gnu.org/onlinedocs/gcc/Instrumentation-Options.html

[danielhollas]

I've run test suite locally with

FFLAGS = -O0 -fopenmp --coverage -fsanitize=address,undefined -fcheck=all -fno-inline -fimplicit-none -Wall -Wno-integer-division -Wno-maybe-uninitialized
LDFLAGS = --coverage -fsanitize=address,leak,undefined

I found one issue that is fixed in #160. We should consider having an extra workflow with these settings enabled but without coverage, because fcheck=all apparently messes up the code coverage.