added Portfile for diffpy.utils
ignore PortIndex files
Add the science category.

Fix code alignment as in the zope Portfile.
Require setuptools for installation.

Added depends_build as per example in py-zope-app-module Portfile.
The namespace in diffpy package is still not handled correctly.
This might have something to do with setuptools upgrade.
add 00-clean.zsh
use 00-clean.zsh in 03-package.zsh to clean the files
Update INSTALL.txt

typo fix
Update BUILD.txt

change libgsl-dev to libgsl0-dev
manually copy system libboost_python and libboost_serialization into the build
Add instructions for user-only installation.

Add python-dev and libgsl-dev package to the requirements.
Update tags when pulling from git.

Also add support for specifying tag or hash for the released
version.
Understand ranges of package indices.
Clean pycifrw package if previous build failed.

An empty CifFile.py from a failed build would make all the
subsequent builds fail as well.
Add python-lxml to the list of required packages
add patchelf to build.txt
add eclipse project files to .gitignore
update build instruction for EPD users
Create BUILD.txt
revert back
add update script in the build

boost source code in cctbx should be included in the bundle