DWDS/Dialing Concordance Code

+ updated docs

+ added common/ddcObject.h : common base class ddcObject
- user data void *m_User (for perl wrappers)
- stringification method toString()
- json stringification methods toJson(), jsonClass(), jsonData()
- object substructure methods Children(), DisownChildren(), Descendants(), Traverse(), TraverseConst()
* for future use in perl-wrappers (better reference counting)
+ re-factored CQuery, CQFilter, CQueryOptions, CQueryCompiler into ddcObject

+ added configure option --disable-json-complex-context

+ v2.0.38-pre1: complex json context tokens, lexer fixes, and query-tree node extraction
+ CQFContextSort::toString() fix for nontrivial match-ids
+ added CQuery::m_User, CQFilter::m_User, CQueryOptions::m_User (user data, e.g. for perl-wrapper SV*)
+ updated lexer regex for '#cntxt' keyword to (?i:\#(co?n?te?xt?|n)) [was: (?i:\#(cntxt|n))]
+ complex extra-sentential hit tokens in json mode (no longer simple strings)
+ added CQuery::Children(), CQuery::Descendants(), CQuery::DisownChildren()
- for future use in perl-wrappers (better reference counting)

+ CQFContextSort::toString() fix for nontrivial match-ids

* contextsort toString fix

+ moved stale README.moo to doc/buildnotes.moo

+ updated docs

+ pod fixes

+ allow -limit -1 for ddc_simple (all available hits)