BibUpload: recjson deletion

* Introduces new BibTasklet to update the recjson value after BibUpload
  runs over a series of records. (closes #1708)

Signed-off-by: Esteban J. G. Gabancho <esteban.gabancho@gmail.com>
1: D209 Put multi-line docstring closing quotes on separate line
1: D400 First line should end with '.', not 'r'
1: D205 Blank line missing between one-line summary and description
1: D208 Docstring is over-indented
47: D103 Docstring missing
57: D103 Docstring missing
277: D103 Docstring missing
453:18: E127 continuation line over-indented for visual indent