* 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
* Split STAmount out of SerializedTypes.h
* New concept of "Issue consistency": when either both or neither of its
currency and account are XRP.
* Stop checking for consistency of Issue in its constructor.
* Clarification of mIsNative logic in STAmount.
* Usual cleanups.
* Better automatic conversions to and from tagged uint160 varints.
* Start using tagged variants of uint160 for Currency, Account.
* Comments from 2014/6/11 RippleCalc session.
* Rename many variables.
* Make most of PathState private.
* Extract out common Node::isAccount() code.
* Rename bConsumed to allLiquidityConsumed_.
* Extract out code into PathState::clear().
* Rename unity files
* Move some modules to new subdirectories
* Remove obsolete Visual Studio project files
* Remove obsolete coding style and TODO list
