NDG_UNHIDEPROV - Un-hide an ancestor in a provenance structure

Description:

This function ensures that a given ancestor is not flagged as "hidden". See NDG_HIDEPROV and NDG_COPYPROV.

Invocation:

CALL NDG_UNHIDEPROV( IPROV, IANC, STATUS )

Arguments:

IPROV = INTEGER (Given)

An identifier for a structure holding the provenance information read from an NDF, as returned by ndgReadProv

IANC = INTEGER (Given)

The index of the ancestor NDF to be un-hidden. The value is used as an index into the ANCESTORS array. An error will be reported if the value is too large, or is less than 0.

STATUS = INTEGER (Given and Returned)

The global status.

Notes:

• No error is reported if the specified ancestor is not currently hidden (in which case this function returns without action).