* Added "dummy" data file for technologies (for now it simply copies the
old, line-based technologies) and corresponding XML schema
* Added missing SQL stored procedure to clear all dependencies and
reverse dependencies from a technology
* Added import classes, loader and import tool for the technology graph
* Added tech graph import tool to post-build tests
* Added a few resource definitions and the corresponding strings. While
the descriptions are blank, and resource definitions themselves are
incomplete (relations to e.g. technologies are missing), this should
allow easier testing of the rest of the resources system.
* Implemented resource definition loader including tests
* Added resource definition xml file and style definition
* Made a small style change to i18n loader
* Added structures for resource definitions, natural resources
definitions, resource providers, empire resources and empire mining
settings (both empire-wide and planet-specific).
* Added a few common utility functions to the SQL test suite. These
functions allow test initialisation to be a little shorter.
* Added "MINE" production type and an associated building definition.
The production will not be added to the XML dump or to the output of the
planets summary page, as this is extremely temporary.
* Added base classes for all importable data. These new classes should
be used for all future loaders; all existing loaders that are modified
should be updated.
* I18N loader rewritten to make use of the new base classes. External
strings are now read using the XML data file's path as the base
directory.
* Updated all external I18N definitions and moved the existing files
around in an attempt to make the data directory somewhat more livable.
* Added dependency management entry for the server's main package to the
root project, updated server distribution package accordingly. Added
dependency on the server's main package to the server's testing package.
