DWDS/Dialing Concordance Code

+ DDC::Client - added nodes() method to wrap new ddc-v2.2.8 'nodes' server command

+ DDC::PP updates for ddc-v2.2.8 release (#prune, new ':'-operator syntax & semantics)

- DDC::PP compatibility for ddc-v2.2.8 release

* ddc.pc.in : ladd += -lDDCjsoncpp

+ debug sefaults for toHash() involving new #prune[] filters
- seems to be fixed by adding missing ddcObject API-methods CQFPrune::Children() and DisownChildren() methods in DDC itself (for m_keys)

+ added missing ddcObject API methods Children(), DisownChildren() for CQFPrune
- fixes segfaults with DDC::XS toHash() method when prune-filters are involved

fix bug in json generation (the free bibl string can be null)

+ DDC::XS updates & fixes for ddc-v2.2.8 (in progress)

* stringification parseability fix for CQFPrune::toString()

* stringification parseability fix for CQFPrune::toString()