[web2py] Fpdf error with python 2.6 and web2py 2.2.1

[carlo]

No error with web2py 1.9.4.

With 2.2.1 I got this with Python 2.5 and Python 2.6

Traceback (most recent call last):
  File "C:\Python25\web2py\gluon\restricted.py", line 212, in restricted
    exec ccode in environment
  File "C:/Python25/web2py/applications/Hcontrol/controllers/default.py" 
<http://127.0.0.1:8000/admin/default/edit/Hcontrol/controllers/default.py>, 
line 1000, in <module>
  File "C:\Python25\web2py\gluon\globals.py", line 188, in <lambda>
    self._caller = lambda f: f()
  File "C:/Python25/web2py/applications/Hcontrol/controllers/default.py" 
<http://127.0.0.1:8000/admin/default/edit/Hcontrol/controllers/default.py>, 
line 558, in pdf_prev
    pdf.add_page()
  File "C:\Python25\web2py\gluon\contrib\fpdf\fpdf.py", line 284, in add_page
    self.header()
  File "C:/Python25/web2py/applications/Hcontrol/controllers/default.py" 
<http://127.0.0.1:8000/admin/default/edit/Hcontrol/controllers/default.py>, 
line 540, in header
    self.image(logo,10,8,50)
  File "C:\Python25\web2py\gluon\contrib\fpdf\fpdf.py", line 896, in image
    info=self._parsepng(name)
  File "C:\Python25\web2py\gluon\contrib\fpdf\fpdf.py", line 1749, in _parsepng
    color += re.sub('(.{3}).',lambda m: m.group(1),line, flags=re.DOTALL)
TypeError: sub() got an unexpected keyword argument 'flags'

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