src/native/jni.c: removed jvmti.h included cacaodbg.h for GetEnv - jvmti

src/native/jni.c: removed jvmti.h included cacaodbg.h for GetEnv - jvmti
src/native/vm/VMVirtualMachine.c: formatting changes/removed debug statements
src/native/vm/VMMethod.c: (getName/getSignature/getModifiers/getLineTable): (Samuel Vinson) new implementation. (partially changed by motse)
src/native/jvmti/cacaodbg.h: removed unused function declarations
src/native/jvmti/jvmti.c (getcacaostacktrace): new implementation - does not yet handle traces of not current threads correctly.
	(GetMethodName): fix: return JVMTI_ERROR_NULL_POINTER only on method == NULL
	(GetFrameCount/GetStackTrace): fixed check for valid thread argument.