Fix prefix space issues with certain tokenizers #156
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This adds a heuristic to catch tokenizers (e.g., Llama) which treats a word starting a string has having a prefixed space, where previously the extra space added at the start of "continuations" in ranked classification task leads to a spurious space token (so for instance total probability mass over answer choices A/B/C/D in MC tasks drops from around 1 to near zero).