"checkpoint act one" gives generic error

[Andrew Schultz]

This is only for testers, but if you have another round--or if you incorporate this into the sequel, I think this'd be nice to have.

"I only understood you as far as wanting to checkpoin." (This is cut off by glulx's 9-letter limit.)

But more importantly--you might want to say "Jump to checkpoint is the correct syntax, trying that"

See cave-troll example in the inform docs, replacing "^" with "jump to"

[Daniel Stelzer]

Fixed. ("checkpoint" or "checkpoint [text]" is now understood as a Mistake.)