cholera 0.9.1

Georeferenced Data and Functions

• provisional support for (georeferenced) longitude and latitude for data and
  functions (for functions, set latlong = TRUE).

Data Changes

• add longitude and latitude to plague.pit data.
• add frame.segments
• amend road.segments with latlong data.
• use amended road.segments (w/ latlong) in various functions.

Documentation Changes

• restore .jpg and .png to README.
• restore NEWS.md to source file and amend markdown.

Function Changes

• rename neighborhoodData() to sohoGraph().
• add/set drop.isolates = FALSE in embedNodes() and neighborhoodData().
• add latlongPlaguePit() and plaguePitPDF().
• add/set addPlaguePit(latlong = FALSE).
• add rotatePoint(dataset = "plague.pit").
• vectorize addFrame(), addRoads() and landmarkPerimeter().
• add/set embedNodes(drop.isolates = TRUE).
• export isoVertices().
• add/set plot.iso_vertices(add = FALSE).
• rename isoLines() to isoPoints() and add/set isoPoints(add = FALSE).
• amend/simplify latlongOrthoAddress().
• archive latlongEmbed().
• rename squareCenter() in addLandmarks() to squareCenterB().
• amend pump 2 (Adam and Eve) warnings in casePump() and pumpPump().

Function Fixes

• correct class for sohoGraph() output.
• use cholera::roads$id rather than indices to fix latlongFrame().
• add variable check to latlongLandmarks() and landmarksPDF().
• fix typo in name of quadrantCoordinates().
• fix/amend pump 2 (Adam and Eve) warnings in casePump() and pumpPump().