ndgBegpv - Begin an NDF provenance block

Description:

This routine should be called to mark the start of an NDF provenance block. The block should be ended by a matching call to ndgEndpv. See ndgEndpv for more details.

Note - provenance blocks must not be nested.

Invocation:

void ndgBegpv( int $*$status )

Arguments:

status

The global status.