Public Git Hosting - survex.git/commit

Allow tape or backtape to be omitted

Reported by Erin Lynch

lib/survex.pot		diff \| blob \| blame \| history
src/datain.c		diff \| blob \| blame \| history
tests/back2.out		diff \| blob \| blame \| history
tests/back2.pos		diff \| blob \| blame \| history
tests/back2.svx		diff \| blob \| blame \| history
tests/badreadingdotplus.out		diff \| blob \| blame \| history
tests/normal_bad.out		diff \| blob \| blame \| history

Survex is a software suite to aid mapping cave systems