DWDS/Dialing Concordance Code

+ added *.opt options LemmaQueryUsesMorphPattern, DefaultQueryIndex
+ added parsing of boolean values for *.opt options to CConcIndexator::LoadOptionsFromString()
- this means we can finally override pre-specified boolean flags
+ added CConcIndexator::m_OpDefaultIndexNames : operator-specific default index names
- potentially useful to discriminate between _ (bareword TokInfl queries) vs. @_ (literal match) and /_/ (regex, globs)
- idea: map _ to Lemma, set default expander Lemma to some (CAB-based) external best-lemmatizer,
and avoid the traffic, computational load, and loss of both precision and recall associated with
the current all-inflected-forms strategy of CQTokInfl
+ cleaned up some lingering bigrams-index crud