Avoid locale issues in generating forcing .mat files

[BSchilperoort]

This PR tackles issue #38. The problem is circumvented by removing the date string entirely and making it blank.

Note: PR includes commits of #45, to avoid merge conflicts and to have the Windows tests work.

Discussion of this "bug" on hdf5storage.

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Tested on:

• [x] Windows
• [x] Linux
• [x] Octave
• [x] MATLAB

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