src/gfxcore.cc: Simplify accounting for size of blobs on measuring
line.
src/moviemaker.cc: Fix to build again with libav/ffmpeg.
src/gfxcore.cc: Don't crash with assertion failure when showing
passages for a cave with no vertical extent.  Reported by Jonny
Prouty.
lib/de.po,lib/de_CH.po: Update.