Added marking queue, and made tutor clients callbacks.

Minor changes.

Implemented persistent tutor client. ...

Hopefully this solves the weird issues we were seeing with the tutor
clients deadlocking.  Will also make the Android client simpler which
should again reduce race conditions.

Scale map fonts when window is resized.

Simplified the timeout when trying to find server. Now applies to all ...

clients - not just the student client.

Code cleanup. Been playing with a few different static code analysis ...

tools.  Used them to recommend the changes made in this commit.

Split out the computer name resolving stuff. Should be easier to add ...

new resolvers if/when ITS start using their random computer names in all
labs.

Clean up. Fixed logging statements, added private constructors to ...

classes that should never be instantiated.  Fixed author names to be
consistent.

Added 'always on top' mode for Tutor Client.

Changed to mousePressed rather than mouseClicked because clicking labels is a ...

bit weird (seem less tolerant of movement during click than buttons).

Also attempting to fix problem with tutor client occasionally losing sync which
is probably due to threading (maybe server request thread deadlocking).

Lots of improvements: ...

- Separated the queue label into a new panel.
  - Got rid of the now unnecessary AbstractMap base panel for maps.
  - Made the queue label handle overflow (put it in a scroll pane)
  - Show a message dialog for when now map can be found
  - Machine IDs can now be passed as command line arguments - this
    overrides the COMPUTERNAME env var.
  - Made the request/cancel methods synchronized instead of using a sync
    block inside those methods.  This seems to have improved the overall
reliability when mass requests are made, and hopefully fixes the
deadlock that the tutor-client occasionally had.

Improved TutorClient. Huge refactor. Icon now read from classpath/jar.