This makes sphinx's autodoc slightly happier.

This implements a GraphView class which allows for convenient,
independent filtering graphs.

Use Palatino as default font, and remove underline from links.

This adds a check for directed graphs in most functions of the flow
module, and renames the kolmogorov_max_flow to
koybov_kolmogorov_max_flow.

This also optimizes the graph augmentation in
koybov_kolmogorov_max_flow, where reversed edges are detected and used
if they exist.

Added more DOI links to references, and other cosmetic changes.

This also keeps compatibility with earlier versions of boost.

This fixes ticket 61:

http://projects.skewed.de/graph-tool/ticket/61

This module contains several search algorithms and a visitor interface.

Now an explicit conversion to a compatible python type is attempted if
the value being set in a property map cannot be converted directly to a
C++ type.

This also fixes a bug with vector-valued property maps.

Now, whenever GraphWrap is being used, the property maps are always
in "checked" mode.

The arrays returned by PropertyMap.get_array() are now PropertyArray
instances, which keep track of the PropertyMap data, and are able to
detect when it changes, and raise a ValueError exception. As such, it
becomes impossible to read or write to non-allocated memory if an array
becomes invalid.