fixed some minor javascript warnings
eliminated some code duplication in index.jsp

The list of classes to apply to the table and the opening table element
itself is no longer repeated.
use the conventional "form:" prefix with Spring form tags
modified request URI mappings in controller classes

The request mapping annotations and view names specified in the
controller classes now use /ui/fixtures.  Still need to make
corresponding changes to the JSPs and Javascript.
removed assertion for 'Details' cell in FixtureViewValidator
added a JSP tag for producing the fixture row controls
moved enrollment form to views/fixtures/enrollment.jsp
created new fixtures/index.jsp and corresponding javascript
added top-level index with a redirect to the fixtures view
moved fixture controllers to dedicated package
fixed an unused import warning
renamed enrollment controller
fixed botched enrollment.jsp commit\n\nSome how some git output was redirected into the file.
more cleanup from botched commit on enrollment.jsp
fixtures view now adds entity id attribute when row added to table
Merge pull request #20 from ualerts-org/AFDP-51

Work in progress on AFDP-51