Pymix fix: short note on compiling PyMix on Ubuntu

A fix for users of Python 2.6 or 2.7 when installing PyMix:

	# 3 steps
	# 1) in setup.py
	# change
	from distutils.core import setup, Extension,DistutilsExecError
	#to:
	from distutils.core import setup, Extension
	from distutils.errors import DistutilsExecError
	# 2) in setup.py
	# change
	numpypath = prefix + '/lib/python' +pyvs + '/site-packages/numpy/core/include/numpy' # path to arrayobject.h
	# to
	# (locate arrayobject.h) - for me this path was
	numpypath = '/usr/share/pyshared/numpy/core/include/numpy'
	# Finally
	# 3) in /usr/local/lib/python2.7/dist-packages/AminoAcidPropertyPrior.py
	# change
	as = alpha.pop(0) # (line 170)
	# to
	dummy = alpha.pop(0) # 'as' is a reserved keyword

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