as usual get it here. the change-log:

fixed bug (rare random crash) identified by david burnett.
initialize new xforms with better defaults for parametric
variations (based on interpolated-against xforms). add id envar,
like nick/url. add clone_action envar. return to xform
interpolation based on complex logs, but make consistent decisions
about counter/clockwise rotation across the sheep edges.
interpolation_space attribute to flame element can be set to
"linear" to go back to the simpler method, or "log" to use this
new (default) method.