DOLFIN install should check for python-ply

If python-ply is not installed, this happens during the cmake configure:

-- Generating SWIG interface.
-- --------------------------
Traceback (most recent call last):
  File "/data/pfarrell/src/local/fenics-opt/src/dolfin/cmake/scripts/generate-swig-interface", line 36, in <module>
    from dolfin_utils.cppparser import *
  File "/data/pfarrell/src/local/fenics-opt/src/dolfin/site-packages/dolfin_utils/cppparser/__init__.py", line 1, in <module>
    from CppHeaderParser import CppHeader
  File "/data/pfarrell/src/local/fenics-opt/src/dolfin/site-packages/dolfin_utils/cppparser/CppHeaderParser.py", line 51, in <module>
    import ply.lex as lex
ImportError: No module named ply.lex

and the Python interface isn't built.

Surely it should be treated consistently with the other packages on which DOLFIN optionally depends, no?

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