patch 8.0.1093: various small quickfix issues

Problem:    Various small quickfix issues.
Solution:   Remove ":" prefix from title set by a user. Add the qf_id2nr().
            function. Add a couple more tests.  Update documentation.
            (Yegappan Lakshmanan)

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1093,
 /**/
     1092,
 /**/