Retire deprecated Options classes

[briadam]

Remove classes SequenceStatisticalOptions and
MetropolisHastingsSGOptions. Required writing new copy constructor so
MhOptionsValues could be built from an MLSampleLevelOptions object.

This to be merged to dev prior to completion of #569 I don't think there's anything too controversial to request review on, but wouldn't mind a quick look. Some of the code will cleanup as I finish up #569

[briadam]

Actually one outstanding question: can code protected by

#ifdef QUESO_USES_SEQUENCE_STATISTICAL_OPTIONS

be removed? SsOptionsValues in particular? That preprocessor define is hardwired off in Defines.h, but associated code is not marked deprecated, so I left it in place, although didn't test as flipping that define caused all manner of chaos.

[codecov]

Codecov Report

Merging #649 into dev will increase coverage by 0.3%.
The diff coverage is 92.18%.

@@            Coverage Diff            @@
##              dev     #649     +/-   ##
=========================================
+ Coverage   74.85%   75.15%   +0.3%     
=========================================
  Files         312      312             
  Lines       23794    23692    -102     
=========================================
- Hits        17810    17805      -5     
+ Misses       5984     5887     -97

Impacted Files	Coverage Δ
src/basic/src/VectorSequence.C	93.75% <ø> (ø)	⬆️
..._StatisticalInverseProblem/test_no_initial_point.C	95% <ø> (ø)	⬆️
src/stats/src/MLSamplingLevelOptions.C	90.18% <ø> (ø)	⬆️
src/stats/src/MetropolisHastingsSG.C	72.8% <50%> (+0.03%)	⬆️
src/stats/src/MetropolisHastingsSGOptions.C	89.38% <93.54%> (+20.77%)	⬆️

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[roystgnr]

That define looks like it's been hardwired since 2012, and we're obviously not supporting it, so I'd say strip it out, but let's wait to hear from @dmcdougall to confirm first.

[roystgnr]

I think I'd have factored into commits slightly differently, but the end result looks good and the intermediate commit passes "make check" too so I'm happy.

[briadam]

Yes, I confirmed it passed in between. I would have done differently as well, but had missed some code on my first pass (due to conditional compilation) and it didn't seem worth a careful revert and re-apply. I'm thinking I'll merge this PR and then pick up the sequence stat options based on Damon's feedback.