Changes

Updated submodules.
Submodule src/main/web 424447c..0bdf290:
 > Made documentViewer robust against // in URLs.
 > Adjusted colors in bar diagram. Submodule src/main/xproc
0703a2e..9782e84:
 > headNote as sigil tooltip in apparatus
 > Fixed broken // links.
 (commit: a728e57)