A request to cancel a job was not processed correctly. The cancelling
routine of a task must run, regardless of the (non-final) state. Now
it works like this: if a job is currently running, it is interrupted
and its cancel routine is invoked. It then enters "cancelled" state.
If it is stuck, it is loaded and only its cancel routine is run. If it
is in a final state or waiting, it is removed from the queue.
The job executor depends on backend module, since it may control the
application via user tasks. The `ONode` can now be moved from the
store module into the backend module.
- When converting from html->pdf, the wkhtmltopdf program exits with
errors if the document contains invalid links. The content is now
cleaned before handed to wkhtmltopdf.
- Update emil library which fixes a bug when reading mails without
explicit transfer encoding (8bit)
- Add a info header to converted mails
Html and text files are not fixed to be UTF-8. The encoding is now
detected, which may not work for all files. Default/fallback will be
utf-8.
There is still a problem with mails that contain html parts not in
utf8 encoding. The mail text is always returned as a string and the
original encoding is lost. Then the html is stored using utf-8 bytes,
but wkhtmltopdf reads it using latin1. It seems that the `--encoding`
setting doesn't override encoding provided by the document.
Periodic tasks are special in that they are usually kept around and
started based on a schedule. A new component checks periodic tasks and
submits them in the queue once they are due.
In order to avoid duplicate periodic jobs, the tracker of a job is
used to store the periodic job id. Each time a periodic task is due,
it is first checked if there is a job running (or queued) for this
task.
This client can be used within the backend app and later in other
modules. The `OJoex` object is replaced with a better implementation
where the http client is initialized once on app start.
