[PATCH] Reduce CXString abuse

[Dmitri Gribenko]

Hello,

As suggested on IRC, ContainerUSR is not really a CXString, but it
should own the underlying memory buffer.  Thus, it is better to change
the type to std::string.  This will not introduce extra copying
overhead, since the workaround that is being removed was already
making a copy.

Dmitri

-- 
main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
(j){printf("%d\n",i);}}} /*Dmitri Gribenko <gribozavr at gmail.com>*/
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