added some warnings in installation
added some warnings in installation

sdss/marvin,bretthandrews/marvin,sdss/marvin,albireox/marvin,bretthandrews/marvin,bretthandrews/marvin,sdss/marvin,bretthandrews/marvin,albireox/marvin,albireox/marvin,sdss/marvin,albireox/marvin