Complete support of git commit info with IPython.sys_info().

This will give us an easy way for users to report platform details,
without trying to cram lots of data into the version string.

Now, the version information in release.py is simple and doesn't
attempt to read version control data at runtime.  We expose sys_info()
as a top-level function so it's very easy to remember/direct for new
users.

Minor doc/copyright notices updates in the same files.

IPython/testing/iptest.py

@@ -115,7 +115,7 @@ have['gobject'] = test_for('gobject')
 def report():
     """Return a string with a summary report of test-related variables."""
 
-    out = [ sys_info() ]
+    out = [ sys_info(), '\n']
 
     avail = []
     not_avail = []