Changes

Updated submodules.
Submodule data b98db07..2198045:
 >  Updated xml files Submodule src/main/xproc 4b58fe61..a68ed152:
 > Added cells for column "Zeugen (nur Gegenzeichen)"
 > Watermarks: treat "", "-", "k.A." the same -> ""
 > Cope with encoding as in faustedition/xml#123
 > Updated testimony table from wiki
 (commit: edcd127)