Commits on Mar 11, 2018

1. integrate: Correctly handle manual, meijerg, risch flags …

   Only one of manual, meijerg, risch can be True, since True means "use
   only this method" (per [the documentation of
   `integrate`](http://docs.sympy.org/latest/modules/integrals/integrals.html#api-reference)).
   This was not checked.
   ```
   >>> integrate(1/x, x, risch=True, manual=True)
   log(x)
   ```
   Also, the option manual=True did not actually prevent meijerg integration
   ```
   >>> integrate(exp(x**2), x, manual=True)
   sqrt(pi)*erfi(x)/2
   ```
   Both are corrected now: ValueError is raised if more than one True is
   given, and whenever one is True, the others are set to False.

   

   normalhuman committed Mar 11, 2018
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