std::string overloads for xfstream

[Smith-Rowland, Edward M]

Here is a revised patch with end of line witespace removed and all the new functions in the ChangeList.

Note: when testing this patch I had to add the empty file "testsuite/data/fstream_members-1.txt" by hand.  The file is needed to make the basic_fstream testcases pass.  The patch utility seems to clobber things that are empty at the end of the process.

Ed


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