[SPR-8386][SPR-8387] Refined logging regarding detection of default resource locations and default configuration classes.

- Removed generatesDefaults() and supports() from the SmartContextLoader SPI and modified the DelegatingSmartContextLoader algorithm accordingly.
- DelegatingSmartContextLoader no longer operates on a list of candidate loaders but rather on explicit instances of GenericXmlContextLoader and AnnotationConfigContextLoader.
- Updated Javadoc regarding DelegatingSmartContextLoader as the new default loader.
- Updated and polished Javadoc regarding changes in 3.1.
- Now enforcing @ContextConfiguration's restriction on declaring locations or classes but not both.

overridden @PersistenceContext annotations on subclass methods are being processed correctly (SPR-8594)

SPR-6464 Use the redirect URL and its request parameters (if any), instead of a synthetic key, to match a FlashMap instance to its intended recepient request. This should help to prevent conflicts in most cases transparently. Only if necessary a controller can add extra request parameters to distinguish the request even more uniquely.

Issue: SPR-8591

SPR-6464 Drop @FlashAttributes, add ResponseContext, ViewResponse, and RedirectResponse types for annotated controllers to use to prepare a redirect response with flash attributes; Add FlashMap and FlashMapManager and update DispatcherServlet to discover and invoke the FlashMapManager.

Issue: SPR-8579

removed GenericConversionService logging in order to avoid toString side effects (and to avoid isTraceEnabled overhead; SPR-8297)

Issue: SPR-8570

Replace RequestBodyNotValidException and RequestPartNotValidException with MethodArgumentNotValidException and add MethodParameter information to the exception message.

SPR-8536 When two methods match a request for any content type (i.e. Accept=*/* or no Accept header), choose the one that doesn't define any 'Accept' media types by default. This addresses an important use case where methods serving browsers typically don't specify Accept media types.

SpringBeanAutowiringSupport is able to process @Value annotations on any given target instance (SPR-8574)

Issue: SPR-8570

added getContentAsByteArray() and getContentAsString() methods (SPR-8575); actually implemented forward, include and handlePageException methods

SPR-8524 Add flag to AbstractCachingViewResolver to suppress subsequent resolution of unresolved view names.

SessionFactory proxies created by (Annotation)SessionFactoryBuilder now
implement InfrastructureProxy to ensure they are automatically unwrapped
for transaction resource management purposes.

Issue: SPR-8492