Added ch.elexis.externe_dokumente as found in elexis 2.1.7
Added ch.elexis.externe_dokumente.tests as found in elexis 2.1.7
Called elexis_2_to_3.rb for ch.elexis.externe_dokumente
Ignore .gitignores in subdirectories. Also all *.rej *.orig
Manual changes for externe_dokumente