How to make a scanner plugin.
Introduction to Gambit plugins:
Plugin are self-contained pieces of code that are compiled in separate objects external to Gambit itself. At runtime, ScannerBit selects and loads the appropriate plugins based on inifile entries. The plugin themselves can be used for a wide variety of purposes. "scanner_plugin"s specify a plugin that will be used as a scanner whereas "objective_plugin"s are general use plugins that can be used as test functions, likelihoods, priors, etc. Below is an discription and instructions for these plugins.