Qr log improvements

[Richard Raynor]

Use of single date, time from and time to arguments on queries does not include the date used in info level logs. It is suggested this is included (qrscu line 1259 for my version)

Include a record in the log when a task is aborted using the task administration interface of the website

[Ed McDonagh]

Setting single_date logging to INFO from DEBUG to match other date settings. Refs #738

→ <<cset 5fb17e579d10>>

[Ed McDonagh]

Logs task aborts from Tasks interface in appropriate log. Tested for exports. Refs #738

→ <<cset 547784d61764>>

[Ed McDonagh]

Added abort logging from exports interface and pt size imports interface. Refs #738

→ <<cset 505004a26d41>>

[Ed McDonagh]

Adding ref #738 to changes.

→ <<cset 94a55263c08e>>

[Ed McDonagh]

Celery 4.3 has been released with a minimum Django version of 1.11! Refs #738 only because that is where it was first caught.

→ <<cset dbe6e8c3edc4>>

[Ed McDonagh]

Merged in issue738qrlogimprovements (pull request #294)

Fixes #738

→ <<cset 8c68d879cd69>>