- Made arf, pha, and rmf classes a bit more tolerant by allowing
reading of files where extensions are identified only by HDUCLAS*
keywords.
- Replaced deprecated auto_ptr by unique_ptr.
- Added SPneedVecCol routine to check whether a column should be vector
or scalar.
- Changed SPcopyKeys so it only copies keywords that do not already
exist in the target extension. This prevents overwriting keyword
values that have been set by the tool calling the routine.