Removed warning message from accel.bouts.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/accelerometry@62 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Added warning in accel.bouts back in, but as a message instead of a warning.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/accelerometry@63 edb9625f-4e0d-4859-8d74-9fd3b1da38cb