Made font_manager.py close opened files
Fixed typo: "_clipath" changed to "_clippath"
added sameers xcorr patch
added usevlines signature to xcorr, acorr
fixed errorbar for the new vlines, hlines signature
fixed error introduced in spy() in previous revision
stripped some dead units code
units refactoriing
get rid of 'from pylab import *'
remove 'from pylab import *' in docstring example