DWDS/Dialing Concordance Code

+ 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)