cext: stop worrying and love the free(NULL) There is no need to check for a NULL pointer before calling free since free(NULL) is defined by C standards as a no-op. Lots of software relies on this behavior so it is completely safe to call even on the most obscure of systems.

templatefilters: undeprecate hgdate See the previous patch for why. Backed out changeset 0fe65bb7e160

templater: restore the original string format of {date} Unfortunately, python-hglib relies on that. I could fix python-hglib, but there would be other tools that take a decimal separator as the separator of unixtime and tzoffset. The showfmt is set per instance since new code uses '%d %d' format by default.