DWDS/Dialing Concordance Code

* added macro DDC_GETBREAK_LB_MIN to QueryNode.cpp
- threshold for use of std::lower_bound() in break-identification step of CQueryNode::ConvertOccurrencesToHits()
- default value = 16k -> ca. 10% faster queries

v2.1.19-pre1 * added macro DDC_HIT_INTERSECTION_BINSEARCH to QueryNode.cpp
- use std::lower_bound for evaluating hit-list intersection and difference
- may be 3-5% faster for large hit-lists (function words)
* attempted profiling of CQueryNode::ConvertOccurrencesToHits() [perf, callgrind]: no insights

v2.1.18 release

+ force LC_NUMERIC=C in ConcordOptions.cpp (otherwise JSON responses may not be parseable)

+ v2.1.18-rc2: force LC_NUMERIC=C (in progress)

* fixed ddc_split in presence of legacy anonymized tokens (those beginning with -#)
- workaround (hack): all types with 0 occurrences in source corpus are assumed to by anonymized,
and are added to the output vocabulary of *every* partition -- this is a bit bloated but should work
* added ddc_index option --anonymize (-a): enable legacy anonymized tokens (disabled by default)
- fixes mantis #31586

* trim *._con_prefix

* added AC_DEFINE()s for __STDC_LIMIT_MACROS, __STDC_CONSTANT_MACROS
- workaround for old C++ compilers (e.g. debian wheezy)
- fixes compile error for ddcTime.cpp: 'SIZE_MAX' was not declared in this scope

- mantis #31439: added missing Trim() for m_CommonFilePrefix in CConcIndexator::LoadCorpusFiles()

+ updated version