Blender Git Loki

Added 'Evaluation Time' setting access to Path Animation panel.

This was previously only available from the datablocks viewer, but this is the direct replacement to the badly named 'speed' ipo-curve in the past ('speed' implies a rate that must be integrated/added to the results of past frame, rather than a factor).

Also, tweaked the RNA definition so that this shows as a slider (i.e. a factor), since the valid values for this are clamped to the [0, 1].