sympy/sympy — pull request #2650 by zanzibar7 (2013-12-04 21:26:32+00:00)
Title: manualintegrate can now handle Heaviside(x)

- Integral(Heaviside(x),x) == Max(0,x)
- enable simple substitutions
- add manualintegrate tests for Heaviside
- add to docs for improving manualintegrate

Also, rename "Log" integration commands to Reciprical for
readability in manualintegrate module