Remove IssuerFlow

* Remove IssuerFlow as it is dangerous and its presence in the finance module risks accidental use in non-test code. As written it will issue arbitary amounts of currency on request from any node on the network, with no validation barring that the currency type is valid.
* Unify interface to CashIssueFlow to match the previous IssuerFlow

docs/source/example-code/src/integration-test/kotlin/net/corda/docs/IntegrationTestingTutorial.kt

@@ -67,9 +67,11 @@ class IntegrationTestingTutorial {
                 thread {
                     futures.push(aliceProxy.startFlow(::CashIssueFlow,
                             i.DOLLARS,
-                            issueRef,
                             bob.nodeInfo.legalIdentity,
-                            notary.nodeInfo.notaryIdentity
+                            alice.nodeInfo.legalIdentity,
+                            issueRef,
+                            notary.nodeInfo.notaryIdentity,
+                            true
                     ).returnValue)
                 }
             }.forEach(Thread::join) // Ensure the stack of futures is populated.