Use -1 for "unknown" for file sizes. #168
Merged
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Change rs_file_size() to return -1 for unknown file sizes and update docstring in librsync.h. In sumset.c update rs_signature_init() work correctly for sig_fsize<12.
Update sumset_test.c to use -1 for unknown filesizes and add some tests for checking invalid blake2 strong_len arguments.