Add function autocomplete / documentation in job create/edit form

[rshk]

• Autocomplete the function name with a widget like this:

+-------------------+-------------------------+
| module:func1      |                         |
| module:func2      |  function documentation |
| module:func3      |                         |
+-------------------+-------------------------+

The left column contains a list of candidate completions; the one on the right contains the documentation for the selected completion, if any

[rshk]

We don't need this anymore, as we removed job editing forms