Leo 4.5 RC2

Leo is an outlining editor for programmers, a general data management environment, a project manager and browser. Leo is written in 100% pure Python and is fully scriptable.
NOTE: Leo is developed and distribtued under the terms of the Python License (CNRI Python License).

Main features:
- A general data management environment.
Leo shows user-created relationships among any kind of data:
- computer programs, web sites, etc.
- Leo shows multiple views of data within a single outline.
- An outlining editor for programmers.
- Leo supports optional noweb and CWEB markup.
- A flexible browser for projects, programs, classes or any other data.
- A project manager.
- Portable. Leo runs on Mac OS X, Windows, and Linux.
- 100% pure Python.
- Fully scriptable using Python.
- Leos outline files are XML format.
- Open Software, distributed under the Python License.

Enhancements
- Minor changes to how Leo computes home directory, and related docs.