clarified changeType steps and conditions + added possibility to come back from 'both types active' state

the new variant pushState will append new states itself + SystemState becomes an accessor to TW.states[-1] + start simplifying changeType

via user-configuration of a ranking metric to choose k best labels from the cluster's node set (available from the facet-options dialog box)

NB: still need to rm old nodes1 nodes2

as usual we don't touch the sigma or plugin code, but simply restrict event propagation (plugin's handlers are on body, but events come from sigma container first)

optional: can be set in conf with 'moreLabelsUnderArea' flag, uses our new functions circleGetAreaNodes() and redrawNodesInHoverLayer()

added for node rendering with various cases (active/neighbor/normal/grey), then made the labels renderer call the node renderer

(it fixes the black color init cases)

show nbClasses and nbNodes side by side, don't count N/A class in nbClasses if empty, rename vars to be clearer

translations for the color menu can be specified in TW.conf.facetOptions + make clusterColoring work for string-labeled clusters + allow user to choose if colors are randomized each time

assumed that source gexf file was equivalent to having a 'name' node attribute, which is not the case in specifications?

global var selections removed and stored inside SystemState + transformed into an array everywhere (was inconsistent) + fixed changeType selection materialization ; possible TODOES: better setState function, possible integration of opposite side neighbors in SystemState too

heatmap coloring, better facetOptions cases, better handling NaN in attributes and renamed coloring functions

we consider an attribute is numeric if a large % of it is numeric (by default: 98%)... in this case we can still operate binning and the NaN values are grouped and isolated in a grey legend item

added binning mode 'samerange' + new syntax for choosing it in settings + finished replacing atts_2_exclude + possibilities for better string cluster mapping TODO: color functions per settings

but we should rather use the sigma.exporters.gexf.js

renamed to TW.states and TW.gui + fixed old sliders caching bug + fixed node normalization in parsing

variables init was obscuring settings file + moved AjaxSync back to globalUtils + fixed selector engine instance scope