Most images are generated by development/tools/generate_symbols_images.py, but
some were drawn manually. Now there is no image missing from the ones the
script can generate.
This fixes our documentation file when they are viewed as DVI.
Fixes#5945.
Please test converting the Tutorial to DVI and the math toolbar buttons on all platforms.
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@29715 a592a061-630c-0410-9148-cb99ea01b6c8