Details about bicoloring found in ColPack

[amontoison]

cc @gdalle

		/// Whether or not color 0 is used for left vertices
		/** i_LeftVertexDefaultColor ==
		- 0 if color 0 is not used
		- 1 if color 0 is used
		//*/
		int i_LeftVertexDefaultColor;

		/// Whether or not color 0 is used for right vertices
		/** i_RightVertexDefaultColor ==
		- 0 if color 0 is not used
		- 1 if color 0 is used
		//*/
		int i_RightVertexDefaultColor;

		/// The number of colors used to color Left Vertices
		/** Note: Color 0 is also counted if used.
		If color 0 is used, i_LeftVertexDefaultColor will be set to 1.
		//*/
		int m_i_LeftVertexColorCount;

		/// The number of colors used to color Right Vertices
		/** Note: Color 0 (or actually (i_LeftVertexCount +  i_RightVertexCount + 1)) is also counted if used.
		If color 0 is used, i_RightVertexDefaultColor will be set to 1.
		//*/
		int m_i_RightVertexColorCount;

		int m_i_VertexColorCount;

		/// The color IDs used to color the left vertices (rows).
		/** Note: Color IDs start from 1, color ID 0 should be ignored
		//*/
		vector<int> m_vi_LeftVertexColors;

		/// The color IDs used to color the right vertices (columns).
		/** Note: Color IDs start from (# of rows + 1), color ID (# of rows + # of columns + 1), which is color 0, should be ignored
		//*/
		vector<int> m_vi_RightVertexColors;