The coal and paper web themes will highlight closed branches as a visual cue to
the user. This patch makes the other two themes constistent.
For users with difficulty differentiating colors, it would be better to split
out closed branches to a new table or optionally hide them.
Remove the `install_package_data' subclass of `install_data' and use
the `package_data' functionality provided by distutils instead. As
package data must be located within the package directory, the data
files are now generated in the build directory.
To simplify the functionality of this change, the top-level `doc' and
`templates' directories have been moved into the `mercurial' package
directory.
