Allow a configurable hitTolerance

[geographika]

This allows an application to increase the hit tolerance when selecting features. The default is set to the OpenLayers default of 0 so any existing applications will be unaffected.

It can be applied in the Map.js file of an application which extends CpsiMapview.view.main.Map

    mapViewConfig: {
        projection: 'EPSG:2157',
        zoom: 11,
        center: [616038, 629971],
        hitTolerance: 3 // use 3 pixels when selecting features, as this makes it easier to select a line
    },

This makes it easier to select lines, rather than use the default of 1 pixel.

Clickable features are set in classes extending from CpsiMapview.controller.MapController using the clickableLayerConfigs:

    clickableLayerConfigs: {
        'NETWORKEDGES_WFS': {
            keyField: 'ObjectId',
            modelClass: 'Example.model.network.Edge',
            editWindowClass: 'Example.view.edge.EdgeWindow'
        },