Keep "csv" formatter as is. Introduce new "csv-with-package" formatter.

Emacs-company plugin is switched to "csv-with-package" format.

Adding one field to "csv" formatter breaks local sublime plugin. It's python
there, args spread goes into a function with 3 arguments, it says you give it
4 and throws an exception.

Fucking fuck. I said - backwards compatibility, please.

See: #463

emacs-company/company-go.el

@@ -71,7 +71,7 @@ symbol is preceded by a \".\", ignoring `company-minimum-prefix-length'."
 (defun company-go--invoke-autocomplete ()
   (let ((code-buffer (current-buffer))
         (gocode-args (append company-go-gocode-args
-                             (list "-f=csv"
+                             (list "-f=csv-with-package"
                                    "autocomplete"
                                    (or (buffer-file-name) "")
                                    (concat "c" (int-to-string (- (point) 1)))))))

formatters.go

@@ -123,6 +123,18 @@ func (*emacs_formatter) write_candidates(candidates []candidate, num int) {
 type csv_formatter struct{}
 
 func (*csv_formatter) write_candidates(candidates []candidate, num int) {
+	for _, c := range candidates {
+		fmt.Printf("%s,,%s,,%s\n", c.Class, c.Name, c.Type)
+	}
+}
+
+//-------------------------------------------------------------------------
+// csv_with_package_formatter
+//-------------------------------------------------------------------------
+
+type csv_with_package_formatter struct{}
+
+func (*csv_with_package_formatter) write_candidates(candidates []candidate, num int) {
 	for _, c := range candidates {
 		fmt.Printf("%s,,%s,,%s,,%s\n", c.Class, c.Name, c.Type, c.Package)
 	}
@@ -163,6 +175,8 @@ func get_formatter(name string) formatter {
 		return new(nice_formatter)
 	case "csv":
 		return new(csv_formatter)
+	case "csv-with-package":
+		return new(csv_with_package_formatter)
 	case "json":
 		return new(json_formatter)
 	case "godit":