Remove the overzealous BEGIN_P check and handle blockdepth tracking preparation with minimal overhead in light of the validator's error checking.
Remove the overzealous BEGIN_P check and handle blockdepth tracking
preparation with minimal overhead in light of the validator's error
checking.

tpostgres-projects/tPostgres,tpostgres-projects/tPostgres,tpostgres-projects/tPostgres,tpostgres-projects/tPostgres,tpostgres-projects/tPostgres