timestr (timediff[,style[,format]])
Converts times to printable strings. Always exported. Takes the following arguments:
The object containing the times to be formatted.
The output format. The possible values of style are:
allShows all of the following times: wallclock, user, system, user time of children, and system time of children.
autoLike all, except that if the children times are both zero,
it acts like noc.
nocShows all except the two children times.
nopShows only wallclock and the two children times.
Indicates the printf(3)-style format specifier (without the leading %)
to use for printing the times. The default is "5.2f".