I just installed the line profiler because I want to do %lprun, but this is 
broken in 7.4.beta2 (likely is beta0)

┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 7.4.beta2, Release Date: 2016-08-26               │
│ Type "notebook()" for the browser-based notebook interface.        │
│ Type "help()" for help.                                            │
└────────────────────────────────────────────────────────────────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Warning: this is a prerelease version, and it may be unstable.     ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
from[SageTerminalApp] WARNING | Error in loading extension: line_profiler
Check your config files in /home/travis/.sage/ipython-5.0.0/profile_default
Traceback (most recent call last):
  File 
"/home/travis/sage-build/local/lib/python2.7/site-packages/IPython/core/shellapp.py"
, line 246, in init_extensions
    self.shell.extension_manager.load_extension(ext)
  File 
"/home/travis/sage-build/local/lib/python2.7/site-packages/IPython/core/extensions.py"
, line 85, in load_extension
    if self._call_load_ipython_extension(mod):
  File 
"/home/travis/sage-build/local/lib/python2.7/site-packages/IPython/core/extensions.py"
, line 132, in _call_load_ipython_extension
    mod.load_ipython_extension(self.shell)
  File 
"/home/travis/sage-build/local/lib/python2.7/site-packages/line_profiler.py"
, line 372, in load_ipython_extension
    ip.define_magic('lprun', magic_lprun)
AttributeError: 'SageTerminalInteractiveShell' object has no attribute 
'define_magic'

Volker and IPython upgrade people, please fix this (and %attach).

Travis

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