* src/threads/threadlist.hpp (ThreadList): Adapted thread counting methods to

* src/threads/threadlist.hpp (ThreadList): Adapted thread counting methods to
hide internal threads from Java. Also added some comments.
* src/threads/threadlist.cpp (ThreadList::get_active_java_threads): Implemented.
(ThreadList::get_number_of_daemon_java_threads): Likewise.

* src/native/vm/gnuclasspath/gnu_java_lang_management_VMThreadMXBeanImpl.cpp:
Adapted to above changes.
* src/native/vm/openjdk/jvm.cpp (JVM_GetAllThreads): Likewise.
* src/threads/posix/thread-posix.cpp: Removed obsolete counting code.
* src/threads/thread.cpp (thread_new): Counting via threadlist requires that
flags are set during threadobject creation.
* src/vm/global.h (MAX): Defined as macro.
* src/vm/vm.cpp (VM::VM): Remember VM initialization time.
* src/vm/vm.hpp (VM::get_inittime): Returns above time.