deprecated-procs.tcl

Reform of site-nodes-procs

- made XOTcl2 based implementation of site-nodes usable during
initial bootstrap
- made new site-node cache implementation working for Oracle
- now, the same code works during bootstrap, for PostgreSQL and Oracle
and independent of xotcl-core being installed or not.
- removed old and broken nsv-based site-node cache
- reduced need of .xql files (removed query for delete.delete_site_node)
- moved deprecated calls to deprecated-procs.tcl

This change make the code much clearer and eases maintenance and debugging.