* Header-only!
* No external dependencies or other beast modules
* Compilation options allow for:
- Stand-alone application to run a single test suite
- Stand-alone application to run a set of test suites
- Global suite of tests inline with the host application
- Disable test suite generation completely
* Existing tests reworked to use the new classes
* Use nullptr (C++11) instead of NULL.
* Put each file into its own namespace declaration.
* Remove "using namespace" directives and add scope qualifiers.
* Control when beast's implementation of std::equal (C++14) is used.
* Tidy up some const declarations.
Conflicts:
src/ripple_app/shamap/SHAMapSync.cpp
src/ripple_app/tx/TransactionEngine.cpp
* negative cache for node store
* async fetch, thread pool for node store
* read barrier logic for node store
* SHAMap getMissingNodesNB (non-blocking)
* non-blocking getMissingNodes traverse
* tune caches
* SHAMapItem::getData is not needed
* SHAMapTreeNode::getItem is not needed
* SHAMapTreeNode::getData is not needed
* No need to copy them when constructing transactions
* No need to copy them when computing map deltas
* No need to copy them in deepCompare
* No need to copy them in SHAMapTreeNode's copy constructor
* Inbound ledger and SHAMapAddNode cleanup
* Log acquire stats
* Fix progress logic
* Remove ledgers we no longer need to acquire
* Stash stale state data in our fetch pack, it can still be useful
* Stash in fetch pack if acquire terminated while job was pending
* Account for duplicate/invalid nodes in a few cases previously missed
* Dispatch each InboundLedger once (not per data)
* Trigger only the "best" peer
* Don't call tryAdvance on failed acquires
