v3.1
build: ccache works better without embedded version strings
maint: update copyright year ranges to include 2011
maint: remove inclusion of unused header, for "make syntax-check"
doc: insert comma in --help line for --ignore-space-change (-b)
maint: prepare for the tight-scope check
diff: don't use locales after local-specific sorting fails
maint: remove all uses of vfork: use fork instead