Bayesian Pattern Filtering Library

Some header names have changed, and the interface for accessing data from Filter::score_stream is improved. Read src/NAME_CHANGES for details explaining changes to the file and class names from v0.1. See the info documentation for a description of how to use the library. There is a bpf::Ratio class which allows for exact score calculation. It uses the GNU Multiple Precision Library, which is widely available for many platforms.

This release adds work to allow classes to be used as base
classes. This is being done as part of a project to write bpmflat, a
mail filter which uses libbpfl.

The bpf::Bucket.load() and save() methods have been changed to take
const std::string arguments instead of char*.