move digits_in_decimal (in digest_blocksize) to numeric_digits library
add constexpr for better diagnostics
add natural width properties for printf-like functions
refactor context_hash related classes
fix minor "include" issues
refine compute-hash example
fix set_file_size_constant issue when size is larger than max_size
add hash tests
add digest_generator tests (minimum)
make AC_CONFIG_SRCDIR to point actual "source" file
add static_assert for ssdeep parameters
add "ignore compatibility" configuration option
bump version to 3.0-rc8