Attempt at hardening the re-writing of the feature file by first writing to a temp file renaming.
Attempt at hardening the re-writing of the feature file by
first writing to a temp file renaming.

bk: 4f88468a_u1SdLwHnW-wO239qROTaQ
bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper