WFCAM: Broaden the scope of the moving-target recipe.

The same recipe works for both NEOs, and satellites and debris.  Give
the recipe a more-generic name and modify the prologue to reflect
this.
WFCAM: Add a remark about the lack of an accurate WCS.

It should be obvious that the auto astrometry is not possible,
but it doesn't harm to be explicit to contrast with JITTER.
WFCAM: Add a note about the refined WCS.
WFCAM: Correct a heading in the pod.