DWDS/Dialing Concordance Code

+ removed bogus leading globalCountKeyDelim and extraneous space after delimiters in count-keys
- hacked backwards-compatibility code in BranchServer.cpp
* a ddc-2.0.38 branch-server CAN use count-keys from a leaf-server <v2.0.38
* BUT a branch-server <v2.0.38 will NOT use count-keys from a branch-server >=v2.0.38 correctly (first character will be lost)

+ BranchServer compatibility fix for handling ddc <=2.0.37 style count-keys with bogus spaces

+ default arguments for CQSeq::new()

+ CQCount doc fix

+ CQKeys index-name parsing fix

+ v0.03: added support for CQKeys class (requires ddc >= v2.0.38-pre4)

+ CQKeys::toString() and ::toJson() fixes

+ querydoc updates and keys() cleanup

+ keys() queries now accept '-' pseudo-index (ignored for proxy generation)

v2.0.38-pre4: count() refactoring, keys() queries, bugfixes
+ re-factored count-query evaluation from ConcHolder.(h|cpp) into QCount.(h|cpp)
- removed some redundant CQueryResult fields from CConcHolder (m_SortOrder, m_bSortByString)
+ re-factored CConcHolder::GetHits(): added variant for pre-parsed queries
+ removed implicit space-separation in CQCountKeyExprList; we already have globalCountKeyDelim=\002, which is ugly but more useful
+ fixed bug setting Result.m_AllHitsCount in ConvertCountsToHits()
- we were getting m_AllHitsCount=512 (== Limit == m_pIndexator->m_MaxCachedHitsCount) for subcorpora with more real count-hits
+ added keys() query type: extract tuples to query from a count()-query
- pretty ugly: it needs to evaluate the count()-query in CQKeys::Compile() in order to generate a proxy query
(in general CQWith-conjunction of CQTokSet queries)
- currently over-generates, since the key attributes are queried independently