dynamic allocation of replica cells; include some additional space groups

git-svn-id: svn://dasher.wustl.edu/tinker@53 9dbd3ec4-0870-4ad8-bd6a-181c4f7deb04
remove unused "maxcell" variable from sizes.f,  update bench8

git-svn-id: svn://dasher.wustl.edu/tinker@54 9dbd3ec4-0870-4ad8-bd6a-181c4f7deb04
patch bug related to VIBBIG located in numerical second derivatives

git-svn-id: svn://dasher.wustl.edu/tinker@55 9dbd3ec4-0870-4ad8-bd6a-181c4f7deb04