Some dependencies and Updated files

Added new dependencies that I am likely to include in the Engine when I
start on my coding spree again.  Included the updated copies of
data_base and conversions files. They are highly tested and stable.
Their syntax is also highly checked for consistency. A second look
doesn't hurt, but I spent a year updating them as part of another big
project. data_base and conversions files are now under the LGPL license.