Rename test.
Update args printer, add test suites for initialization methods.
Update config option help text.
Integrate command help printer (incomplete).
Deprecation comment.
Add help columnize tests and fix implementation.
Update  doc for help changes.
Reorganize help metadata, rename prevout args, add printer tests.
Update printer tests.
Comments.
Remove header class qualification for format_category() method.
Add is_base2() utility function.
Make base2 primitive safe for non-base2 characters (handle error).
Comments and text.
Merge pull request #93 from evoskuil/develop

Update help configuration, printer and tests.
Merge pull request #94 from libbitcoin/develop

Reorganize help metadata, add printer tests.