New IntCal13 calibration data!
IntCal13 is latin1-encoded.

Previous calibration curves are ASCII-encoded so it should work fine.
[data] Add IntCal98 and Marine98 calibration data.

The original files were downloaded from
http://c14.arch.ox.ac.uk/intcal98.14c and
http://c14.arch.ox.ac.uk/marine98.14c and are available in the
*14c..orig files. The *.14c files were modified to be consistent
with the more recent calibration data.
Make IntCal13 the new default calibration curve