if there's no track in root, load list of tracks
put  in the index.html conf so that it's more visible to people doing integration
bugfixes to config system handling of baseurls and sourceurls
move @sauloal dataset selector into its own view, call it from the main error handler if datasets are configured (and they are not just the default datasets).  closes #397.
Merge branch 'sauloal-dataset-list'
resolve nameUrl and refSeqs in included configuration files