Adding INSTALL.txt as a symlink to docs/src/install.rst.
Adding INSTALL.txt as a symlink to docs/src/install.rst.

git-svn-id: e6d44ec3d56a4b51a9cad284a9139aeaee5a4315@120 3447e8dd-9f38-0410-a211-e3037a7e05e3

arnaudsj/pebl,arnaudsj/pebl,arnaudsj/pebl