Exclude = from percent-encoding in MultiProtocolURL

fix http://mantis.tokeek.de/view.php?id=185 and http://mantis.tokeek.de/view.php?id=280

source/net/yacy/cora/document/id/MultiProtocolURL.java

@@ -495,7 +495,7 @@ public class MultiProtocolURL implements Serializable, Comparable<MultiProtocolU
      * <li>The ASCII characters 'a' through 'z', 'A' through 'Z',
      *     and '0' through '9' remain the same.
      *
-     * <li>The unreserved characters & : - _ . ! ~ * ' ( ) ; , remain the same.
+     * <li>The unreserved characters & : - _ . ! ~ * ' ( ) ; , = remain the same.
      *     see RFC 1738 2.2  and  RFC 3986 2.2
      * 
      * <li>All other ASCII characters are converted into the
@@ -531,7 +531,7 @@ public class MultiProtocolURL implements Serializable, Comparable<MultiProtocolU
                     || ch == '~' || ch == '*'
                     || ch == '\'' || ch == '('
                     || ch == ')' || ch == ';' 
-                    || ch == ',') { // RFC 1738 2.2 special char (may be used unencoded)
+                    || ch == ',' || ch == '=') { // RFC 1738 2.2 special char (may be used unencoded)
                 sbuf.append((char)ch);
             } else if (ch == '/') {                 // reserved, but may appear in post part where it should not be replaced
                 sbuf.append((char)ch);