Add initial manual integration implementation
Integration by parts, general improvements
Add documentation
Make parts rule more robust
Python 2.5 compatibility
Add manualintegrate to Integral._eval_integral
Python 2.5 compatibility (again)
Better integration with integrate()
Work around ODE test
Fix tests
Fix doctest
Add docstring to manualintegrate
Move namedtuple to compatibility
Make manualintegrate more robust with regards to u-sub variables
Use Dummy variables for u-substitutions
Use isinstance for typechecking
Merge pull request #1927 from lidavidm/manual_integration

Manual integration