DWDS/Dialing Concordance Code

+ fix mantis bug #22236: trim leading & trailing whitespace from "Bibl constant" fields

* refactored legacy StringTokenizer class into ddcString.h
- was doubled: common/string_tokenizer.h (inline) and common/util_classes.h with implementations in CommonLib/utilit.cpp
- refactoring used code from utili_classes.h + utilit.cpp
* fix mantis bug #19695: trim leading & trailing whitespace for "ServerInfoFile" option
- also for "include", "Indices", "HitBorders", "Expand", "ExpandBibl", and "ServerInfo" options
- fix uses new method StringTokenizer::get_rest_trim()

fix mantis bug #21486: added new CCUrl.m_Redirects option for curl-based expanders; default=10

+ added ddc-bibl-dump.perl (debugging utility)

v2.1.4: suppress bogus initial empty field fix for branch-servers (bug introduced in v2.1.3)

+ fixes for v2.1.3 (namespaces)

+ v2.1.3: added utility class StringSplitter in ddcString.h
- object-oriented string-splitting pseudo-iterator, allows empty fields
- fixes mantis bug #20790 (empty values cause column-misalignment in count-query output)

v2.1.2: fix lexer stack hacks from 2.1.1 which can leave lexer in an inconsistent state

+ v2.1.1 release final cleanup

+ qtAverage(): return 0 on empty query set (b/c JSON doesn't like 'nan')