Gsql prepared statements

Audit list
 - [ ] GSQLBackend
 - [ ] SSql
 - [ ] gMySQL
 - [ ] gPgSQL
 - [ ] gSqlite3
 - [ ] gOracle
 - [ ] BIND (dnssec)
 - [ ] mydns
d_DeleteDomainQuery_stmt expects a domains.name, not domains.id