OrcaOutput

Preliminary support for ORCA output parsing is provided in output.OrcaOutput.

Only works for sure on HF, LDA-DFT, GGA-DFT, mGGA-DFT (conventional and hybrid). Maybe RS-DFT or DH-DFT.

List the available data, categorized, with examples.

Completion indicators (probably one of these will become a superclassed requirement).