/downloads/diffpycmi.rst

[XiaohaoYang]

update license if necessay
update the installation instructions, based on lastest release
1. add instructions on compiling boost(?)
2. add instructions on updating srfit using update script in release
3. add more instructions on adding diffpy to python other than system python

[pavoljuhas]

Recompiling boost for Enthought settings is too specific.
Let's have only instructions for installing with Linux system Python.

We should do (2) and also have instructions for rebuilding the installation with/respect to the system packages (boost, python, etc.).