DWDS/Dialing Concordance Code

+ escaped non-ASCII strings constants in utilit.cpp

+ escaped non-ASCII strings constants (make clang shut up)

+ fixed some delete[]/delete bugs in src/CommonLib/ddcString.cpp

+ merged -r1434:1435 from tags/ddc-2.2.2-rc2 into trunk (fix compile for g++-5.4.0 / ubuntu 16.04.6)

* fixed ddc_index Schlemiehl-the-Painter bug due to flat sorted list<CStringItem> CFreeBiblStringIndex::m_BuildStringItems
- symptoms: throughput rates reported by ddc_index (exponential decay?) as indexing progresses,
dropping from initial >130k tok/sec to <4k tok/sec after processing ca. 100M tokens in ca. 300K documents
- re-implemented using map<string,DWORD> CFreeBiblStringIndex::m_BuildStringItemsMap
- new code reports near-constant throughput on 5M-token test corpus
+ (150k +/- 9k) tok/sec if input corpus is in OS buffer cache
+ ( 32k +/- 8k) tok/sec otherwise

+ duplicated PtrHolder<T> to ArrayPtrHolder<T> for pointers allocated with new[]

+ fixed missing default return from non-void function CQKeys::GetMatchId()

+ fixed missing default return from non-void function CQKeys::GetMatchId()

+ v2.2.21-rc1: added a bunch of missing virtual destructors, attempt to debug deadlocks and fd-leaks from jemalloc v5.1.0 (debian buster libjemalloc2-5.1.0-3)