[FIX] setup: use pypi version of PyChart

PyChart 1.39 is available on pypi.python.org, use it
in dependency specs instead of the direct link to
unreliable download.gna.org

Closes #6781

requirements.txt

@@ -3,7 +3,7 @@ Jinja2==2.7.3
 Mako==1.0.0
 MarkupSafe==0.23
 Pillow==2.5.1
-http://download.gna.org/pychart/PyChart-1.39.tar.gz#egg=PyChart
+Python-Chart==1.39
 PyYAML==3.11
 Werkzeug==0.9.6
 argparse==1.2.1

setup.py

@@ -87,7 +87,7 @@ def py2exe_options():
                         'PIL',
                         'poplib',
                         'psutil',
-                        'pychart',
+                        'python-chart',
                         'pydot',
                         'pyparsing',
                         'pyPdf',
@@ -128,7 +128,6 @@ setup(
     packages=find_packages(),
     package_dir={'%s' % lib_name: 'openerp'},
     include_package_data=True,
-    dependency_links=['http://download.gna.org/pychart/'],
     install_requires=[
         'babel >= 1.0',
         'decorator',
@@ -144,7 +143,7 @@ setup(
         'psutil',  # windows binary code.google.com/p/psutil/downloads/list
         'psycogreen',
         'psycopg2 >= 2.2',
-        'pychart',  # not on pypi, use: pip install http://download.gna.org/pychart/PyChart-1.39.tar.gz
+        'python-chart',
         'pydot',
         'pyparsing < 2',
         'pypdf',