Add bash script to download a clean developpement environment, should be useful for developers
It will download a part of the new repository organisation (/NEMO) with the required layout (branches, releases and trunk) but mostly empty, only the trunk and the last release will really be downloaded.
Advantages:

• Possibility to work offline like git: create a dev branch by copying the trunk and start coding without a first commit to the repository
• Simple SVN commands without tedious svn+ssh scheme
• Put an end at the scattering of working copies with all local developpements in one place