Specific auxiliaries

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Schur complement system. Routine for retrieving the interface preconditioner from the Domain Decomposition preconditioner:
```
int PCDomainDecompGetInterfacePC(PC the_pc,PC *interface_pc)
```
The interface preconditioner can be set through the options database: use any existing preconditioner option and prefix it with interface_.

Victor Eijkhout
7/27/1998