C.4 Release 0.9-3

No significant added functionality to the main program, but:

• Added -QG and -Qg options (see item `-Q...').
• Added test directory, and test script, which aims to give useful advice about setting DVI2BITMAP_PK_PATH if that turns out to be necessary.
• More discussing in the documentation about generating fonts, specifically referring folk to the `make test' target in the Makefile.
• Now option -q turns off warnings, but not errors (was rather inconsistent before), and -qq turns off errors, too.