Made the autocompletion query case-insensitive

Autocompletion query is now case & diacritics insensitive. Ignoring
diacritics in the query during autocompletion is probably wrong.
However, in the current implementation it cannot be easily fixed, since
autocompletion works off of the terms recorded in the title index
database, and diacritics info is removed during indexing.

Author: veloman-yunkan

src/suggestion.cpp

@@ -346,7 +346,7 @@ TermCollection getTermCompletions(const SuggestionDataBase& db,
 } // unnamed namespace
 
 SuggestionSearch::Results SuggestionSearch::getAutocompletionSuggestions(uint32_t maxCount) const {
-  QueryInfo queryInfo(m_query);
+  QueryInfo queryInfo(removeAccents(m_query));
 
   SuggestionSearch::Results r;
   if ( !queryInfo.wordToComplete().empty() ) {

test/suggestion.cpp

@@ -778,7 +778,9 @@ TEST(Suggestion, autocompletionSuggestions) {
   }));
 
   EXPECT_COMPLETION_SUGGESTION_RESULTS(archive, "Ki", 10, ({
-    // FIXME: query case matters
+    "<b>king</b>",
+    "<b>king's</b>", // XXX: possesive form
+    /*"<b>king-fu</b>", */ // missing
   }));
 
   EXPECT_COMPLETION_SUGGESTION_RESULTS(archive, "pa", 10, ({
@@ -787,6 +789,12 @@ TEST(Suggestion, autocompletionSuggestions) {
     "<b>patient</b>",
   }));
 
+  EXPECT_COMPLETION_SUGGESTION_RESULTS(archive, "pâ", 10, ({
+    "<b>panda</b>",   // XXX: diacritics in the query are ignored
+    "<b>patent</b>",  // XXX: diacritics in the query are ignored
+    "<b>patient</b>", // XXX: diacritics in the query are ignored
+  }));
+
   EXPECT_COMPLETION_SUGGESTION_RESULTS(archive, "1", 10, ({
     "<b>15539</b>", // XXX: non word
     "<b>1933</b>",  // XXX: non word
@@ -798,8 +806,8 @@ TEST(Suggestion, autocompletionSuggestions) {
   }));
 
   EXPECT_COMPLETION_SUGGESTION_RESULTS(archive, "Ze", 10, ({
-    /* "<b>zebra</b>", */ // XXX: missing because of the case of the query
-    /* "<b>zero</b>",  */ // XXX: missing because of the case of the query
+    "<b>zebras</b>", // XXX: plural form
+    "<b>zero</b>",
   }));
 
   EXPECT_COMPLETION_SUGGESTION_RESULTS(archive, "fo", 10, ({