Sort libbitcoin-test.vcxproj.filters
Use data_slice in script functions
Fix an obscure amount-parser corner case

When the shift is zero and there is nothing to the left of the decimal point,
the function wrongly fails.
Rename "amount" to "base10"
Gather the base16 code into its own file
Add a base16_literal conversion function
Optimize base16 decoding
Provide a complete hash ↔ base16 conversion API

* Add an encode_hash function
* Improve the decode_hash function signature
* Add a hash_literal function
Merge pull request #147 from libbitcoin/base16

Base16