Fixes: RIPD-1575. Fix argument passing to runner. Allow multiple unit
test selectors to be passed via --unittest argument. Add optional
integer priority value to test suite list. Fix several failing manual
tests. Update CLI usage message to make it clearer.
If an offer transaction touched multiple ledger entries associated with the same
book, that offer transaction would be published multiple times to anyone subscribed
to that book stream.
Fixes#2095.
Add envconfig test helper for manipulating Env config via
callables. Create new common modifiers for non-admin config,
validator config and one for using different server port values.
* Force jtx to request/receive the 2.0 API
* Force the JSON and WebSocket tests to use 2.0 API
* This specifically allows the Websocket to create 2.0 json/ripple
and get back a 2.0 response.
* Add test for malformed json2
* Add check for parse failure
* Add check for params to be in array form.
* Correct type-o discovered in tests due to stricter checking.
* Add API version to the WSClient & JSONRPCClient test
* Update source.dox with more headers
