Add support for Onsala Space Observatory HARPOS file format
HARPOS format is the last one provided by the Onsala Space Observatory for the ocean tide loading coefficients. It seems containing more coefficients than the classical BLQ format. Both formats are still provided by the Onsala Space Observatory. Therefore, it would be interesting to read this format in order to use it for OceanLoading
class in Orekit.
A file example is given here: http://holt.oso.chalmers.se/loading/example_har.html
The format should be detailed here: http://holt.oso.chalmers.se/loading/ (The link to HARPOS format description is currently broken)