Cleanup:
* Move QUALITY_ONE to Quality.h
* Move functional files up one level
* Remove core.h
* Merge routines into Config.cpp
* Rename Section to IniFileSections
* Rename IniFileSections routines
Add BasicConfig simplified config interface
Use transform_iterator in http::headers
Add base64 conversions and tests
Fix beast::http::headers move members
Cleanups:
* Remove obsolete string formatting function
* Remove unused ADDRESS macro
* Re-scope functions
Inject JobQueue in NetworkOPs
Set version to 0.26.4-alpha
Refactor STAmount:
* Remove unused functions
* Remove unused constructor
* Use delegating constructors
* Mark some observers deprecated
* Clean up declaration parameter names
* Add checked and unchecked constructors
* De-inline unnecessary inlined functions
* Reorder and regroup members into sections
* Move globals from the unity file to the .cpp
* Change some member functions to be free functions
* Put implementation in one .cpp and the test in another .cpp

Remove unused STAmount constructor and delegate two others No change in functionality.
Add missing includes and tidy up
Clean up and restructure sources
Remove unused macros, config variables, and file
Fix missing includes for boost 1.56.0
Split Section to its own header and add convenience accessors
Move some constants to core/SystemParameters.h
Add fee voting configuration and docs (RIPD-564)
Beginning of the SIGNER_LIST_SET transaction [RIPD-479]
Initial SignerListSet transaction deserialization
Creating and destroying SIGNER_LIST ledger entry

Even though the ledger entry is going in, the actual signer list is
not part of the data.  That will get figured out next.
Serialize the SignerListArray into the ledger.