DWDS/Dialing Concordance Code

v2.2.1-pre1
* fixed bug suppressing "Value for bibl field `ATTR' is too long" errors from CFreeBiblStringIndex::RegisterBiblStringItemId()
* built-in bibl fields are now auto-truncated to MaxBiblStringLen bytes (=20kB)
* changed exception handling in CConcIndexatorInvoker::IndexFile() and ::BuildIndex()
- exceptions are now re-thrown, temporary data is left in place, core is dumped (for better debugging)

+ ddc-index: include project name in log-label (not too helpful)

+ added ddc_set_log_label() function

+ added improved compile-time bibl value sanitization in CConcXml (auto-truncate to MaxBiblStringLen)

+ CConcordance::SaveOptionsToString() - include textarea declarations

+ bug-hunt for weird error "CheckOccurrences failed" from genios/badz03
- underlying cause seems to be bibl-field overflow from badz03/../../ddc_xml/data/2009/01/BADZ_5127408954.ddc.xml
- v2.1.25 aborts early with error "Value for bibl field `bibl' is too long (33341 bytes > max=20000 bytes)"

+ ddc_opt.pod typo fix

+ tagged DDC-XS-0.23

added quick&dirty thread-safety class-method DDC::XS::Object::CLONE_SKIP a lka https://perldoc.perl.org/perlmod.html#Making-your-module-threadsafe

* ddc_dump: fixed missing c_str() in printf format