[plt-scheme] Highlighting parentheses.

I have two proposals, for light and dark background, respectively.

#DFFFDF
#FFDFDF
#DFFFFF
#DFDFFF
#FFFFDF
#FFDFFF

#600060
#006060
#600000
#606000
#000060
#006000

By that order. High color contrast between neighbor s-expressions (for 
distinction) and low brightness contrast (for eyes.) If more than six 
colours are needed, rotate.

 Texts 	 Texts 	 Texts
 Texts 	 Texts 	 Texts


Texts 	Texts 	Texts
Text 	Texts 	Texts





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