allow.txt allows words to be added to the dictionary.
One word per line.
Words are at least partially case sensitive -- adding a proper name (e.g. Microsoft) doesn't result in the lowercase variant being accepted (you'd add that on another line).
Prior to 0.0.16-alpha when one wanted to supplement the dictionary, one had to copy the base dictionary and then add more items.
It is nicer if one can just supply the new words without having to maintain a complete copy of the dictionary.
Released in 0.0.16-alpha as: allow.
Note that this is distinct from expect.
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