Merge remote-tracking branch 'public/use_calloc'

changes/bug12855

scripts/coccinelle/calloc.cocci

src/common/compat.c

src/common/container.c

src/common/container.h

src/common/crypto.c

src/common/util.c

src/common/util.h

src/or/circuitbuild.c

src/or/circuitstats.c

src/or/config.c

src/or/cpuworker.c

src/or/dirserv.c

src/or/dirvote.c

src/or/geoip.c

src/or/rendcommon.c

src/or/rephist.c

src/or/routerlist.c

src/test/test_pt.c

src/test/test_util.c