[ANALYZER-2336] - Update rules for applying custom series colors in CCC
* Cleaning up the way that the sunburst recognizing fixed colors.
   Instead of returning a property "isFixedColor" in the color objects (that because of that cannot be protovis cached instances), a nully value is returned whenever the color is not fixed.
   In practice, not fixed colors would always be discarded, and a new color derived from the color of the parent.
* This commit should be accepted at approximately the same time as the corresponding common-ui commit, to avoid inconsistent builds.
Merge pull request #66 from dcleao/ANALYZER-2336

[ANALYZER-2336] - Update rules for applying custom series colors in CCC