add_DataTips

- Added customDataTipCallBack, Separated update function from creation of data tips
- Added setTips_CallBack to add colored tips by mouse click
- placefig_Normalized no need to know screensize now

cleaned up test bench
added a check for interpolation which would fire error

forgot to include one function

screenshot was not updated ?

Now it is possible to specify a different format per curve.
A new chopY parameter can truncate values close to 0 to exactly 0, on a single data tip, without affecting precision of other data tips.

fixed bug when plot contains only one point

- fixed bug when xdata was not sorted or xvalues upon call
- added feature: can define only X or only Y values on tip
- added feature: when plot handles not given as input, consider stem plots too

Hopefully fixed issue with the background color of the data tips.

Now one can pass empty handles ( h_curve_Array) and the function will fetch them from gca.

Fixed background color with simpler HSL space which preserves hue.

Solved this warning by adding a check on interp position of tip:
Warning: Error updating PointDataTip.
DataSpace or ColorSpace transform method failed"

updated for ML2016b: added drawnow to fix potential error
prevent error when data tip out of current xlims

removed unused old code