- support for the privateDB control, which allows regular LDAP operations
  to address the private database instead of the proxied one.
  This is essentially intended for cache monitoring and maintenance
- support for the queryDelete extended operation, which allows to delete
  from the cache database either a cached query, specified by queryId,
  or all queries related to a specific cached entry, specified by entryDN

Also make remove_query_and_data() return void (it returned nothing) and
remove an unused variable.

consistently use SLAP_* malloc macros; alloc sizeof(Syntax *) instead of sizeof(Syntax) for areray of superiors; free resources also in case of failure of syn_insert()

fox to ITS#5070 fix: error out if serialNumber requires size > sizeof(long long) (detected by Coverity)

fix error checking when parsing UUID (detected by Coverity); added check/prettification of UUID, just in case...

let req_modify_s and req_modrdn_s have a common portion to interoperate within slap_mods_opattrs() (ITS#5093)

uniformly exploit rootdn bind; add support for rootdn bind to backends that didn't have it (ITS#4962)

don't dereference save_errnop if NULL; create temporary file in right dir; revert to strtol(3) (ITS#4627)

Add missing unlink().  Update debug messages, move one from spew_file().
Also check the close() return code.