To maintain compatibility with both the XML address tables and the Python scripts
have been modified.

The changes from this commit are mostly automatized by:

* find address_table -name '*.xml' -exec sed -i 's/id="GEM_AMC"/id="GEM"/g' {} \;
* find address_table -name '*.xml' -exec sed -i 's/BEFE\.GEM_AMC/BEFE.GEM/g' {} \;
* find scripts -name '*.py' -exec sed -i 's/BEFE\.GEM_AMC/BEFE.GEM/g' {} \;

with a few exceptions for:

* doc/cvp13.md
* gem/hdl/oh_fe/README.org
* scripts/gem/gbt_dongle/ge21_fusing.py