To improve compatibility with the proposed std::optional a number
of changes were made, one of which is the removal of the implicit
conversion to bool. As a result, returning boost::optional as a
bool value now fails. Explicit conversion to bool used for clarity.
* Properly handle both unsigned and signed integers
* Return parsing error for overlong JSON numbers
* Implement unit test checking the edge cases that are of interest
* Restrict access to SField constructors.
* Make all SField access const.
* Hide and simplify databases used to hold SField constants.
* Separate the two concerns of representing a field,
and maintaining a database of fields.
* Remove AccountItems and AccountItem
* Restructure RippleLineCache to not require shared_ptr
* Avoid expensive copies of base_uint<160> in RippleState
* New I/O paths for client and server role
* New handshake_analyzer detects the peer protocol
* New basic_message class for parsing and storing HTTP messages
* Conditional compilation for selective feature enabling.
* Server supports both current handshake and HTTP handshake
* Set enforce date: September 15, 2014
* Enforce in stand alone mode
* Enforce at source
* Enforce intermediary nodes
* Enforce global freeze in get paths out
* Enforce global freeze in create offer
* Don't consider frozen links a path out
* Handle in getBookPage
* Enforce in new offer transactors
* Rationalize method and filenames, move to subdirectory.
* Use Issue in Node.
* Restrict access to PathState variables.
* Line length and readability cleanups.
* New PathCursor stores path calculation data during rippleCalc.
* Extract methods PathCursor::node(), PathCursor::previousNode()
and RippleCalc::addPath
* Activate async code path
* Tidy up HTTP server code
* Use shared_ptr in HTTP server
* Remove check for unspecified IP
* Remove hairtrigger
* Fix missing HTTP authorization check
* Fix multisocket flags in RPC-HTTP server
* Fix authorization failure when no credentials required
* Addresses RIPD-159, RIPD-161, RIPD-390
