Fixed issue when importing files

  Now avoiding duplicate attributes

  Now adding the Project Mangaer to the list of project members

  Added return_url logic for undefined return_url

  Fixed error with double project_id check

  Dealing with ambigous project_nr vs. project_name

  Fixed importing CSV DynFields

  Fixed issue with customer_project_nr

  Added support for Cost Center parsing

  Added support for cost centers

  Now fixed project import

- fixed issue with single digit day-of-month or month