Modified SPCDecoder to fix bug where older soundings (i.e. 1957) would be read in as 2057.
Modified SPCDecoder to fix bug where older soundings (i.e. 1957) would be read in as 2057.

blizzardwarriorwx/SHARPpy,scollis/SHARPpy,djgagne/SHARPpy,blizzardwarriorwx/SHARPpy,djgagne/SHARPpy,scollis/SHARPpy,djgagne/SHARPpy,djgagne/SHARPpy,scollis/SHARPpy,blizzardwarriorwx/SHARPpy,scollis/SHARPpy,blizzardwarriorwx/SHARPpy