* 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 stored procedures which manipulate technology definitions
themselves (defs.uoc_technology) or their dependencies (defs.techdep_add
and defs.techdep_remove)
