Testing with different compilers and compiler versions

[lars2015]

MPTRAC test cases are not fully reproducible with different compilers and compiler versions.

compiler	compiler version	libraries	operating system	test system	test result	note
gcc	13.2.0	provided by OS	Ubuntu 24.04	GitHub Actions	FAILED	(a)
gcc	12.3.0	shipped with MPTRAC	Stage 2024	JWC login	OK
gcc	12.3.0	shipped with MPTRAC	Stage 2024	JWC compute	OK
gcc	12.3.0	shipped with MPTRAC	Stage 2024	JRC login	OK
gcc	12.3.0	shipped with MPTRAC	Stage 2024	JRC compute	OK
gcc	11.4.0	shipped with MPTRAC	Ubuntu 22.04	Notebook	OK
gcc	11.4.0	provided by OS	Ubuntu 22.04	GitHub Actions	OK
nvc	24.1.0	shipped with MPTRAC	Ubuntu 22.04	Notebook	FAILED	(a)
nvc	23.7.0	shipped with MPTRAC	Stage 2024	JWB GPU	OK	(b)
clang	14.0.0	shipped with MPTRAC	Ubuntu 22.04	Notebook	FAILED	(a)

(a) small numerical differences in GSL statistics functions (stddev, skew, kurt), possibly due to GSL results not being reproducible when GSL is compiled with different versions of gcc? also other (small) differences

(b) GPU test is conducted with make gpu_test rather than make check