DWDS/Dialing Concordance Code

+ v2.0.19 final: re-integrated changes from ddc-2.0.19+stringsort+lrsort branch back into trunk

- added key-offset argument to #left/#right/#by_context, with sensible defaults
- updated query docs
- added break-overflow checks to CConcHolder::InitSortByContext()

+ removed old 'Bigrams' index and extrusions
+ got replacement #left/#right sort operators basically working
- added token-attribute field argument to #left/#right (analagous to #less_by[BIBL,LO,HI])
- added lower-/upper-bound arguments to #left/#right (analagous to #less_by[BIBL])
+ implemented new offset-based context-sort operators #(asc|desc)_by_context
- #left and #right are now basically just aliases for #asc_context with offsets -1,+1
- TODO: improve syntax and make #left/#right real aliases
- TODO: add break-collection bounds-checking to context-sort operators
+ un-method-fied string_socket.h functions (since they're also used by ddc_search pseudo-cgi)

+ created branch svn+ssh://mukau@.../p/ddc-concordance/code/ddc/branches/ddc-2.0.19+stringsort+lrsort

+ 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