- Use ISO complient formats by default - aded extra level of scale (seconds) - add rcparams for all of these stringsclosesmatplotlib#4808closesmatplotlib#4809closesmatplotlib#5086

Switch to using `string.Template` instead of `%` formatting togenerate default matplotlibrc file.  This is to avoid having to escapeany old or new style format strings that we want to put into the defaultmatplotlibrc file.