Move some string tests to their own more properly named files. Add more tests for specialized strings.
character strings.
Added specialized sequence (string) tests for more package functions.
types, fill pointers, adjustable, displaced.)
More tests for EQUAL (on possible specialized strings, strings with fill pointers, and bit vectors with fill pointers.)
Fixed two format ~f tests (prin1 may print the exponent marker if the float type doesn't match the default float read type.