DWDS/Dialing Concordance Code

* v2.2.0-pre2: disable jemalloc by default
- because libjemalloc2 v5.1.0-3 (debian/buster) breaks DDC::XS if it's linked into DDC libs

+ ddc-delay-wrapper.perl: simulate slow response with constant delay

+ tagged ddc-2.2.0-pre1

+ v0.22: added tests for DDC v2.2.0 subcorpus paths (bare '/' and '*' in subcorpus labels)

+ relaxed yyQLexer bareword restrictions for subcorpus labels (allow bare '/', '*')

+ optimized CConcSession::InitFileReferences() using binary-vs-linear dispatch (up to 1.5x faster, avg 63% faster)
+ inspired by Alexey's delwin commit r1294

* updated mmap()-support docs in ddc_files.pod

+ updated change-log

+ udpated docs for v2.2.0
+ renamed optional socket scheme prefix "tcp://" to "inet://"

+ merged -r1321:1383 svn+ssh://mukau@.../p/ddc-concordance/code/ddc/branches/delwin-merge2 into trunk
- includes accepted changes from branch delwin@...:1352