#56 areas.py not importing Blacker properly

[munder12]

In graphics/charts/areas.py (version 1.20), beginning
at line 68

# following 1 line moved to here
from reportlab.lib.colors import
Blacker
if fillColor and not strokeColor:
# from here since also used in else section
#from reportlab.lib.colors
import Blacker
c = Blacker(fillColor,
getattr(self,'_3d_blacken',0.7))
else:
c = strokeColor
...
fc = Blacker(c,
getattr(self,'_3d_blacken',0.8))