Correct upstream/downstream synapse/skeleton count in skeleton info
Connectivity tables: write the number of partners next to ALL
Connectivity tables' grouped bar charts: plot the y axis in integers
TODO: the neuronnameDisplay has to move out of stack.js and into tracingtool.js
Allow HTML code in notes/comments of menu items

If a menu item has a note/comment associated, it now is renderd as-is.
This means they now can contain HTML code (e.g. links) and let the
browser render it. Each note is embedded in a div of the class
"menu_item_note" to make the display easier adjustable. This commit
fixes #536.
webglapp: skeleton text tags are not created by default but on demand.

Fixed error in creating text tags, was only creating one single tag
of each kind instead of as many as necessary.

Found accidental global variables (camera, sphere) and made them local.

Fixed error in variable name "ambienteLight", now there is an ambient light.
Merge remote-tracking branch 'origin/master'
webglapp: fix removal of skeleton text labels and label spheres.
webglapp.js: add espresso/vim tabulation rules
webglapp: properly declare and refer to the render function.
webglapp: rename toggle_zplane to toggleZplane for consistency
with the naming convention followed by the other toggle functions.
webglapp: given that scene options are persistent, acknowledge them
when reopening the 3d viewer.
This includes properly re-adding all skeletons from the Selection Table.
webglapp: remove some of the commented out code.
webglapp: fix reference to project.id in drawmesh().
webglapp: destroy_data function was deleting variables only to recreate them
immediately with a value of null, for no reason.
webglapp: was removing closure-private variables only to re-create them as globals
which is a hell of a bad idea.
webglapp: destroy_data must also delete the meshes and the missing sections.
SVGOverlay: nodes have a radius of 3 and connectors of 8, always.
This implies that for Node, there is now a self.r (always 3, for drawing)
and self.radius (the value of the radius in the database, which is
currently not used for anything).
SVGOverlay: removed two unnecessary calls to toBack()
SVGOverlay: when disabling a Node or ConnectorNode, ensure IDs are disabled.