adding git revision to output header. Unfortunalty, scripts/translate_GDAY_output_to_NCEAS_format.py the removes these comments, so this still needs some work. There are some stabalisers in here as well (just press c to get through them
adding met forcing and gday comments to header of file. Needs a little tidying
removing unecisery comments (i.e 'git info' which would be repeated and climate colname info which is converted anyway) and remving regs which prevent comments from stretching across lines
correcting typos