VHR management for coregistration
Following (#70)
In order to have to same working method, it's seems to be necessary to add some arguments in the configuration file to manage VHR data (eg "VHR_path", "VHR_ref_band" etc).
Most of arguments used by coregister.py will have default values. Like this, this step will not overload the configuration file.
Edited by SebastienPeillet