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Use ClassInfo structure to send a class name along with a classloader
tag for both the class being instrumented as well as the supertype
classes.

Initialize at response at declaration.

Check the result of stat() to make sure we return reasonable value.

Strictly check for errors to ensure that instrumentation jars
can be loaded a passed to the server.

This is safe, as no JVMTI events should be generated before the
agent initialization is complete.

This will be needed to tag class loaders.

This will be needed to properly support classloader identification
in instrumentation requests.

Actually, it should probably live in a separate file,
but that can wait for a while.

Update the users to include debug.h where necessary.

Session support

See merge request !3

Parsing is done in config section.

* origin/master:
  Release unused local references when querying thread name
  Remove setMultipleValDelim() from the marker Parameter class

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