Creates the new string matrix. Improves and implement the usage of the new matrix in the matrix editor and the matrix manager.
Improves the chart feature by adding point labels, possibility to select points and interaction with the MolTableEditor. It also improves the chart manager.
Adds help pages for the chart view, matrix editor and a page about plotting to the SDF-editor help pages. It also cleans up the code and adds copyright text.
Fixes a new and better(?) AIP for the chart plugin and some various fixes:

* Makes it possibly to set the point labels and tool-tips in the charts via the chart descriptor
* Removes a NPE when selections are made in the chart
* Removes two unused radio-buttons from the ChartDialog
* Adds "plot column" to the pop-up menu of sdf-editors column header
* Removes some unused and unnecessary code
* Makes the name change from *UiManager to *ChartManager
Moves the plotFormSDF-class to the cheminformatics plugin and makes some API changes
Merge branch 'KlasJoenssson-ChartAPI' into develop