test/webapp/base-framework.php: When testing FrontController's handling of no HTTP_HOST being set, call 'go' method instead of 'handleRequest', as this is now supported due to the FrontControllerForTesting overriding the "sensitive" parts (session initialization and output).
test/webapp/harness.php: Remove no-longer-necessary method 'renderAndOutputPage'.
src/webapp/base-framework.php: Make 'handleRequest' method private as it is nolonger required to be public for testing purposes (as test clients can call 'go' with overridden 'outputHttpResponse' and 'sessionStart' methods).
src/webapp/base-framework.php: Rework 'checkForMaliciousContent' to support scanning multi-dimensional arrays and avoid breaking if it does come across one, along with relevant test-case (to at least assure breakage doesn't occur).