Implemented the ImportEvents command line tool, which allows event
definitions to be imported. In all cases the tool will try to import all
definitions; if an error occurs, the process continues but the
transaction is rolled back. It skips existing definitions rather than
taking the risk of doing something inappropriate (e.g. deletion of
existing events).
* 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
