Fixed bug in documentUpload dtml - the file upload input had a bobo type description (which is wrong for file upload fields)

Batch size is also now a parameter.

be applies cumulatively.
Updated documentation.

  - Make sure HTMLFile instances got a __name__ that matched the name
    they were assigned to in the class, and

  - Give HTMLFile and Python methods whos names are 'manage' or
    begin with 'manage_' a __roles__ of ('Manager',)

acquisition.