Log Message:
Update to 3.13:

2010-10-26   Gisle Aas <gisle@ActiveState.com>

   Release 3.13

   The fix in v3.12 to try to preserve the SvUTF8 flag was buggy
   and actually managed to set the flag on strings that did not
   have it originally.

2010-10-25   Gisle Aas <gisle@ActiveState.com>

   Release 3.12

   Don't change SvUTF8 flag on the strings encoded [RT#60105]

   Documentation tweaks

2010-10-24   Gisle Aas <gisle@ActiveState.com>

   Release 3.11

   Provide encode_base64url and decode_base64url functions to process
   the base64 scheme for "URL applications".

   The decode_base64() does not issue warnings on suspect input data
   any more.

2010-10-11   Gisle Aas <gisle@ActiveState.com>

   Release 3.10

   Provide functions to calculate the length of encoded and decoded
   base64 strings [RT#62404]