extended acquisition mode support

[johntruckenbrodt]

This adds capability for creating S1-NRB products from SM acquisition mode and GRD products.
The following changes have been made:

• general
  • adjust to the new pyroSAR naming scheme for Stripmap products from SM to S1..S6 (new version yet to be published)
  • enable processing without noise removal and noise power images (currently necessary for SM, see STEP-32688)
• config.ini
  • new parameter product to differentiate SLC and GRD
• source product JSON
  • write mean instead of min for attributes rangeResolution and azimuthResolution
  • write median of all sub-swath values for attributes rangeNumberOfLooks and azimuthNumberOfLooks (they were expected to the be the same but might actually differ in GRDs)
• source product XML
  • write attributes rangeNumberOfLooks and azimuthNumberOfLooks per swath (also for GRDs)
• general product metadata
  • determine number of looks by multiplying the factors applied during processing with those found in the source metadata (to support GRD source products)
  • read multiple swath-specific attributes from the original XML metadata files to support GRD (in SLCs each swath has an own file so the first found value did suffice, in GRDs the info from all sub-swaths is comprised in a single file)
• nrb.format
  • do not create a product if it already exists

[johntruckenbrodt]

@maawoo can you please adjust the XSDs accordingly?

[maawoo]

Sorry, forgot to ask if you had any other commits? @johntruckenbrodt