[v3 parallel mode] Parallel mode vs. movable

[Johannes Singler]

Hi,

http://gcc.gnu.org/ml/libstdc++/2007-12/msg00041.html:

> some additional details, almost obvious, but anyway.
>> FAIL: 25_algorithms/partial_sort/moveable.cc (test for excess errors)
>>   
> This one is because the parallel version of partial_sort doesn't move.

However, the error seems to appear inside the sequential sort routine. 
The parallelized routine uses sequential sort, while the sequential 
partial_sort does not. And AFAICS the movable test is switched off for 
regular sort. So what's the current status? Is sequential "sort" 
currently "movable-safe"?

Otherwise, I would suggest to switch off the test for partial_sort 
meanwhile.

-- Johannes