ENH: connection_test.f90 renamed to connection_mem_leak_test.f90 along with its binaries and rewritten to serve only as a binary file for Valgrind check. Its former use as unit test is now adopted by FUnit .fun files.

NEW + ENH: Added new module normal_m to generate random numbers from Gaussian distribution + simplified CMakeLists.txt

FIX: Fixed exporting environmental variables for used compilers. Now the file compilers.env is saved into the repo-root directory

FIX + ENH: Fixed parameter for turning on/off time profiling. Fixed constructors and destructor in connection_m module. Added missing comments into connection_m module.