Markers div and tab fixed (analysis and markers tabs). Adding, removing, moving and...

Markers div and tab fixed (analysis and markers tabs). Adding, removing, moving and editing of markers fixed. Added two icons (edited in order to have transparent background). Pointer changed to fixed text "+" instead of the current pointer position (which hides the markers). Keeping the dynamical label of the current pointer position in a different place (so that it doesnt hide the markers) is too hard, given the current code.