DWDS/Dialing Concordance Code

+ tagged ddc-2.1.24

v2.1.24

+ tagged ddc-2.1.24-rc1

v2.1.24-rc1
* use new ddcCorpusList::rfind() for CConcIndexator::LoadMaskedFiles()
- string-based file-masking only masks the LAST occurrence of filename key (rather than the FIRST)
- backwards-compatible for old-style unique-filename corpora
- should also Do The Right Thing for "replaced" files snuck in by dstar-ddc-update.perl
- more precise control of file-masking possible with binary CORPUS._masked_ids

+ fixes for clean compilation under gcc v7.3.0 (e.g. ubuntu 18.04.1 LTS)

* new typedef CFileNo = DWORD
* new typedef CMaskedFileSet = set<CFileNo> for CConcIndexator::m_MaskedFiles
* propagate CConcIndexator::m_MaskedFiles correctly through ddc_union, ddc_split using new SaveMaskedFileIds() method

* propagate CORPUS._masked_ids through ddc_union

* added support for CORPUS._masked_ids : binary variant of CORPUS._masked
- quick and dirty implementation uses existing resident set<size_t> CConcIndexator::m_MaskedFiles
* added support for CConcIndexator::m_MaskedFiles in CConcIndexator::DumpIndex() (ddc_dump)

+ tagged ddc-2.1.23

v2.1.23: bug-fix for suffix search (leftmost suffix character wasn't getting tested correctly;
search (*aufzug) in ND found "Aufzug"; culprit was bogus comparison ("ufzug" < "aufzug")