Added the --enable-dev-options option to ProbABEL's autoconf. This sets a few compiler flags specifically for development.

Also updated the INSTALL instructions accordingly. INSTALL contains a few other small updates as well.


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/genabel@1688 edb9625f-4e0d-4859-8d74-9fd3b1da38cb