DWDS/Dialing Concordance Code

* ddc_proto.pod typo fix

+ info and ddc_proto docs for 'Bibl alias'

* added mantis feature #21495: added "Bibl alias" opt-file syntax & resolution
- tested for #has[], #asc[], count-by[]
- most recent declaration wins (analogous to previous handling for physical "Bibl" fields)
- updated ddc_opt.pod docs

+ 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

+ tagged ddc-java-sru-0.1.5

+ v0.1.5: rem corpus: allow / field as surface:text

+ tagged ddc-java-sru-0.0.19 (retroactive)

+ tagged ddc-java-sru-0.1.4