Provide API to get association scores for specific node collocate pairs

example:

$GET 'http://localhost:5673/getCollocationAssociation?w=triftigen&c=Grund'
 { "f1": 29164,"w1":"triftigen", "N": 53225832863, "collocates": [{"word":"Grund","f2":9868871,"f":5425,"npmi":0.286138,"pmi":7.3855,"llr":44929.5,"lfmd":32.1963,"md":19.7909,"dice":0.00108026,"ld":4.1456,"lncount":0,"rncount":5377,"lnpmi":-1,"rnpmi":9.95764,"af":4.16006,"win":286,"afwin":24}]}
diff --git a/derekovecs-server.c b/derekovecs-server.c
index 5b8915f..b2cdb20 100644
--- a/derekovecs-server.c
+++ b/derekovecs-server.c
@@ -538,6 +538,11 @@
   return (strdup(buffer));
 }
 
+char *getCollocationScores(long node, long collocate) {
+    char *res = (cdb ? strdup(get_collocation_scores_as_json(cdb, node, collocate)) : "[]");
+    return res;
+}
+
 char *getClassicCollocators(long node) {
   char *res = (cdb ? strdup(get_collocators_as_json(cdb, node)) : "[]");
   return res;