filter: try to use the Python implementation of FCFGMerge
filter: try to use the Python implementation of FCFGMerge

... seems to work here, and if nobody complains about broken filter
configurations we can remove the Java FCFGMerge implementation.

Change-Id: I0cf2de604bb9c34678174bdf951e70d499ea7df1

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core