TiePoint raster support for MODIS L1b reader

For OC-CCI processing, we require the solar and sensor angles. This code change implements reading these tie-point datasets.

While coding, I have detected that SeaDAS 7 is not compatible with BEAM 5.0 (ok, obvious, it depends on 4.11). But we have changes in the dependencies (different versions of JDOM) that prevent using the SeaDAS readers in BEAM 5.0. Maybe we need to iterate .....