DYNA/ITACA read/write support

Just stumbled over this mail: http://lists.swapbytes.de/archives/obspy-users/2014-January/001164.html
Just adding these files pretty much as is to make everybody aware of this development, I hope the original authors can comment on the status.
Based on this example, a simple `value.replace('_', 'T')` will allow `UTCDateTime` to parse the string without all the extra work. Unless there are some strange corner cases?