DWDS/Dialing Concordance Code

+ updated ddc_proto.pod
+ changed format of 'OrderId' for get_first_hits: now all hits return orderid -0
+ changed string passing for get_first_hits: empty strings now passed as empty strings

+ code cleanup
- subcorpora sort on integers only again
- added subcorpus-level 'no-sort' mode (speeds up unsorted searches)
- added macro DDC_SORTKEY_MAXLEN (= 256): maximum string sort-key prefix for subcorpus->server transmission
+ allows us to use a static buffer in distributed server, speeds things up a bit
- added error-checking code to CQueryNode::AddOccurrences(); avoids segfaults with pathological queries like ("@die *" #right)

+ parse port in ddc-query.perl (for less confusing error messages on failure)#

+ ddc-query.perl: append newline to raw-data results if not already present

+ fix: moved ddc-2.0.18/ from branches/ to tags/

+ v2.0.19: hit-sorting and filtering overhaul: basically working

+ tagged ddc-2.0.18

+ created branch ddc-2.0.19+stringsort from 2.0.18 root

+ load kwic format by default

+ removed debugging code