sorry Re: file.write("stuff",n) failing under CTest on mips*

["Rebecca N. Palmer" <r.palmer@bham.ac.uk>]

Found the problem: write() doesn't stop at the end of a string, and the 
given length was much too long.  (Odd that that was an I/O error not a 
segfault and so reliably arch-specific, but easy to fix)