Add long passages for people who want a longer sit

Eleven passages of 320 to 600 characters, which is two to four minutes at an
ordinary speed. Five are public domain openings that run long by nature; the
rest were written to run long rather than padded.

The floor in getRandomTextItem stops a test being too short. Nothing stopped
one being long, and the dataset simply had none: before this the longest
passage was 320 characters and there were three of them.

465 passages, longest now 500 characters.

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