Patch to make ic2 work even with i.c. 'y(x)= (fwd)

> David:
> > There are only two tests of ic2 in the testsuite, and none in the 
> > share/contrib/diffequations testsuite.  I think we need 
> more before we 
> > can be sure there are no adverse effects.
> 
>   Indeed, there are 37 tests involving ode2 but only 2 
> involving ic2. Maybe the first thing to do would be to add 
> more tests calling ic2 (ideally one test of ic2 for each test 
> of ode2)? Then one could go ahead with the patch. I'll see if 
> I can do that.
> 
>   Best wishes,
> 
>    Christophe Deroulers
> University Paris Diderot-Paris 7

I like tests.  maxima is complex and changes can have unexpected 
consequences (although probably not in this case).

I don't think we need one ic2 test for each ode2 test, but we do need
to test each path through the code, and also the different ways that 
the solutions can be expressed.

I also want to understand what you patch does.  I have never looked at 
the ic2 function before and need to step through some examples.  It is
going to be an inside day tomorrow (43 C) so I will try and find time.

	David

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