rcssserver3D version 0.4 released

This release includes some speed improvements, agent communication,
an implementation of the offside rule, and a first, unfinished version
of the new legged-sphere agent type amongst other things.
Here is a summary with some more details:

• Features (general):

• A cache for node references has been added to the Zeitgeist
  core to speed up the simulation considerably. Thanks go to the
  Brainstormers3D team for the initial patch and to Markus Rollmann
  for the modification and integration.

• The Spark based simulation (which will be used in the future for
  simulations using the articulated agents) has been made much more
  flexible by Markus Rollmann.

• A sample agent and behaviors for a Spark based soccer simulation
  using either small cars or legged-sphere agents has been
  added. Currently, the legged-sphere agents are used by default.
  The behavior of the agents is very simple (in the legged-sphere case)
  and is solely meant to demonstrate how to use the new perceptors and
  effectors.

• Features (soccer):

• The offside rule has been implemented by Hesham Ebrahimi

• Agent communication is now possible. It is based on the
  2D communication model. Documentation can be found in the
  file doc/TEXT_INSTEAD_OF_A_MANUAL.txt. Thanks go again to
  Hesham Ebrahimi for the implementation and documentation

• The lite-monitor is able to draw velocities in 2D and 3D.
  Added by Jan Murray.

• Important fixes:

• Fix for gcc 4.0 and above compatibility by Jan Murray

• An issue with 64bit builds, reported by Li Yang and Patrick Riley,
  was fixed by Markus Rollmann
• The distance error in the vision perceptor was made dependent on the
  real distance by Oliver Obst