Some cleanup in progress of the manage files

• config_defaults_inc.php:
  (g_delete_project_threshold): new option to control who can delete projects
  (g_create_project_threshold): new option to control who can creates projecs

• manage_proj_add.php:

  • use new threshold (create_project_threshold)
  • user print instead of ECHO

• manage_proj_cat_copy.php:

  • use new function category_get_all_rows()

• manage_proj_cat_edit_page.php:

  • add a comment to come back to later

• manage_proj_delete.php:

  • use bew threshold (delete_project_threshold)

• manage_proj_edit_page.php:

  • remove unused GPC parameter f_action
  • use file_is_uploading_enabled() instead of checking one variable ourselves
  • use bew threshold (delete_project_threshold)
  • split categories and versions into two tables
  • use new function category_get_all_rows()
  • use new function version_get_all_rows()

• manage_proj_page.php:

  • use new threshold (create_project_threshold)

• core/category_api.php:
  (category_get_all): renamed to category_get_all_rows
  (category_get_all_rows): return an array of rows instead of a result

• core/file_api.php:
  (file_is_uploading_enabled): new function that determines whether uploading
  is enabled in general
  (file_allow_project_upload): use files_is_uploading_enabled()
  (file_allow_bug_upload): use files_is_uploading_enabled()

• core/project_api.php:
  (project_get_row): new function
  (project_get_field): use project_get_row()

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@1791 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9