increase max tabs in row to 15
sort out two types of seek configuration variables: default(that can be changed via SEEK UI by SEEK admins) and fixed(changed only within seek_configuration.rb by developers). These two types can be converted to each other. E.g.  Fixed variables should be converted to default  if making it configurable with SEEK admin UI, otherwise the fixed value in seek_configuration.rb will always be used. Seek_testing.rb should also be changed accordingly when converting variable type for test