TODO.md

• Add an option for appending values found in the input but not in the -R/-C files to the output
  • When sorting with this option on, the resulting sequence of labels should be the labels in -R/-C in the same order followed by the extra labels sorted
• Improve handling of empty fields
  • Currently, binheat.py will ignore a line of the form "label<TAB><EOL>" but will treat a line of the form "<TAB>label<EOL>" as denoting a relationship from an empty label to "label". Either eliminate the latter behavior or treat lines with a single label as just establishing that the label exists (meaningful only when -S is in effect).
• Add an option for emitting a warning when a field not in a supplied -R/-C file is encountered
• Support comments at the ends of nonempty lines?
• Add more example input files
• Make the margins configurable on the command line?
• Implement the drawing logic as a reportlab.*.Flowable subclass (or factory thereof?)
• Rethink how --transpose interacts with -R and -C
• Add an option for making the column headers slanted (Do it by default?)
• Come up with a new unified input format that allows one to specify everything about the chart's contents in a single file
  • Include a means to specify the locations of horizontal & vertical rules between rows/columns
  • Include a means to specify various different symbols at "hot points"
• Add a function that takes loaded input data, renders a chart, and returns a Canvas object? Saves a Canvas object to a given path?
• Add a Binheat class for containing just the row names, column names, and relation members
  • Give it a classmethod for constructing from an input file and test it
  • Give it a method for rendering as a PDF or some other reportlab object