Resolve "Initialise offset in pack_coupling_array"

[penguian]

Resolves #40.

What is the best way to test such a change? I would suggest a unit test, but as far as I can tell, this project does not have a unit testing framework, regression testing, or continuous integration. In the absence of unit tests, I have tested using https://github.com/COSIMA/access-om2/blob/master/test/test_bit_reproducibility.py Am I missing something?

Also, should I create a separate GitHub account for my NCI work, using [email protected] as my email address?

[russfiedler]

This is a pretty bad bug to let through. I'm not sure how the code ever worked as ifort is generally pretty good at "initialising" with rubbish.We should be compiling and testing with ifort -check all ... or at least enable the uninitialised variable, bounds checking and uninitialised pointers. Arrays are tougher but can be done.. gfortran is pretty crappy at detecting uninitialised variables.