Improved layout; fixed some issues in groups.js

Improved the layout of index.html by giving the Submit button a bottom
margin, removing the space above the report name in the results area
after groups have been made, and making the report name bold (rather
than the number of groups created ("__ groups created")) and unbolding
the number of groups created message; made changes in group.js and
formatting.css to accommodate these changes; fixed some formatting
issues in console.log statements made by group.js