Fix for issue #2 and breaks caused by '^M' characters

[jtsiddons]

Python version of COARE 3.5 was broken. '^M' (equivalent to carriage return) characters had been introduced in all files. This is the main cause of issue #2 (the new lines introduced by '^M' resulted in empty lines being read and np.float('')).

Note that the original coare35vn.py file had been forced into a single line.

This also implements the fix to meteo.rhod following pull request #3 by @milancurcic

Other misc fixes:

• Update np.float and np.int to 64-bit versions (originals are depreciated in recent numpy versions)
• Use relative path os.path.dirname(__file__) to refer to the data file - users no longer need to edit the script (also in COARE 3.6)
• Auto-formats using python black + moving imports to top of file
• Syntax changes (print, raise) for python 3

[deszoeke]

I have not tested, but approve of these changes.