Updates:
        Labels: -NeedsReview NeedsBetterPatch

Comment #18 on issue 1766 by asmeurer: expand(power_base=True) is too  
aggressive
http://code.google.com/p/sympy/issues/detail?id=1766

Regarding the changes to test_nth_linear_constant_coeff_homogeneous, what  
caused the change, for example, from Eq(f(x), C1*exp(-
x + x*sqrt(2)) + C2*exp(-x - x*sqrt(2))) to Eq(f(x),  
C1*exp(-x)*exp(x*sqrt(2)) + C2*exp(-x)*exp(-x*sqrt(2)))? I like the first  
better
because it's consistent with solutions to that type of equation matching  
exp(a*x).  It shouldn't be too hard to call powsimp in the
relevant part of odesimp.

Also, could you make it clear which commits are for review and which are  
WIP/for review for other issues.  Unless these commits
depend on each other (which you should indicate with blocked on), I think  
git cherry-pick is your friend here (i.e., make separate
branches).

I haven't looked at the other parts yet.

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