CFSv2: remove deprecated options

Description

As discussed in #337 (closed) this removes deprecated and defunct options from CFSv2. Except for --IFO which has only technnically been deprecated before the last release in !1361 (merged) (but has been useless for a decade or so, since it was only relevant for an outdated file format), all other options have been deprecated/defunct for a long time and replacements are available where necessary:

• --outputLogPrintf, --internalRefTime, --dopplermax -> long defunct
• --RA, --Dec -> just use --Alpha, --Delta instead
• transient options with Days as unit -> just use the more robust standard options in seconds
• --SignalOnly -> this is the only one giving me trouble and causing the WIP:

@karl-wette from the source code comments, I would have assumed --SignalOnly can be replaced safely by --assumeSqrtSX=1 on fake SFTs with no noise. However, if I do that in testComputeFstatistic_v2_grids.sh it fails the comparison of grid2 against the reference results, as the explicit +4 offset correction in 2F is now missing. I know Reinhard and you discussed this at length in the past, so what would be the correct fix?

API Changes and Justification

Backwards Compatible Changes

• This change introduces no API changes
• This change adds new API calls

Backwards Incompatible Changes

• This change modifies an existing API
• This change removes an existing API

If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.

Review Status

For Karl.