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The JVMTI documentation mentions that these references
(thread_group and context_class_loader) should be managed,
so we call JNI->DeleteLocalRef() on them.

This is to ensure that data that may still be in socket
buffers when close() is called are sent to the other side.
This mainly applies to the Shadow VM agent, because it only
sends data to the Shadow VM server and does not expect any
reply, but it is probably a good practice in general.

When using the compiler (clang) to link object files, passing the
-shared flag is OK, but when talking directly to the linker, the
-dylib flag needs to be used instead.

src-disl-agent/Makefile: use 'ld' instead of 'gcc' for linking.
src-disl-agent/Makefile: avoid -flto for normal builds, may be broken on old compilers found in Ubuntu.
src-disl-agent/Makefile: support building 32-bit and 64-bit versions of the agent library.
build.xml: adjusted to look for the library in os-arch-specific directory.

disl-agent: removed dislagent.h, because it is not needed for anything.
disl-agent: provide thread names and ids during runtime logging where possible.
disl-agent: register also for VM_START event to track the state of the VM.
disl-agent: close connections in Agent_OnUnload handler instead of VM_DEATH callback.

disl-agent: Updated makefile to avoid using -flto and -fwhole-program on Mac OS X, the GCC is usually too old for that.
disl-agent: Updated network.c to define AI_NUMERICSERV if it is missing (which is the case on MinGW and DarwinX).

disl-agent: various cleanups to the header files and imports.

To enable, use -Ddisl.forcesuperclass=true or -Ddisl.forceinterfaces=true in the client JVM command line.

disl-agent: make debugging output more useful by forcing a flush of the output stream after every printf.

- Added an Ant task to create a formatted dump of binary file.
- The Ant build system now generates the files needed by the native agents.
- The DiSL agent build system now expects bytecode.c to be present.

- DiSL agent Makefile: compose library names for all platforms.
- DiSL agent Makefile: use -fwhole-program only with Linux and Windows targets.

- Removed the old DiSL agent code as well as the old Java agent.
- Copied old shared DiSL agent headers to Shadow VM agent.
- Added JDK includes for JNI and JVMTI to avoid looking for them.
- Unified the naming of source directories.
- Updated the test infrastructure to the new build system layout.
- Examples can be now run even from the source distribution.