Fixed #717: Enhance client scheduled status change

[lingxiaoyang]

Fixes #717 by lingxiaoyang

Changes proposed in this pull request:

• Enhancement: display the upcoming change.

  • Case 1:
  • Case 2:
  • Case 3: There is be a warning state if the operation status is "error" or is still "to be processed" with a change date of today or before:

• New functionality: cancel this upcoming change. After prompting the user, deletes the displayed upcoming change.

• New functionality: reschedule this upcoming change. The same status change form is prompted, but pre-filled with the information of this upcoming change (status to, reason, change date and optional end date). Upon confirmation, the schedule will be replaced.

• Removed functionality: the "delete" button on scheduled status modifications list.

• New: in Django admin, ClientScheduledStatus model is added.

• Removed: NOT NULL constraint on Note model. A null value should be considered "default" category or priority, because the PK=1 category or priority object may not exist in database and there's no way to readd it (the PK will only increase).

Status

• [x] READY
• [ ] HOLD
• [ ] WIP (Work-In-Progress)

How to verify this change

See above.

Deployment notes and migration

• [x] Migration is needed for this change

New translatable strings

• [x] If applicable, I have included updated .po files with new strings (see https://github.com/savoirfairelinux/sous-chef/blob/dev/docs/internationalization.adoc)

Additional notes

none

[coveralls]

Coverage decreased (-0.3%) to 94.915% when pulling 657fae718b6c122b03332deecffb7d17bf9a0a52 on lingxiaoyang:fix_717 into 1f36579921e330e8706346d642370208c285c6d1 on savoirfairelinux:dev.

[coveralls]

Coverage increased (+0.1%) to 95.341% when pulling 0ed569c94b75f72f80dc22ee8e1cce62b69d9583 on lingxiaoyang:fix_717 into bbfb37a81e5cd2e80cb08df0ace29b3c35290faa on savoirfairelinux:dev.

[lingxiaoyang]

Removed "WIP" flag. Unit tests and translatable strings are added.

[erozqba]

@lingxiaoyang could you resolve the conflicts, please? Thanks in advance.

[lingxiaoyang]

@erozqba Thank you! I didn't notice that..

[coveralls]

Coverage increased (+0.1%) to 95.39% when pulling 22cb0d9ae47fa6d1524025623e17dd0f90b1c52e on lingxiaoyang:fix_717 into 395ac8252a1de669d46b518f459ba1093a9d47cb on savoirfairelinux:dev.

[lingxiaoyang]

@erozqba OK!

[lamontfr]

@lingxiaoyang I tested all the cases and it works perfectly. Thanks Ling for this excellent work ! You can now merge this PR.

[coveralls]

Coverage increased (+0.1%) to 95.415% when pulling acda830cd72585d13165f91f053ec984ac5ba338 on lingxiaoyang:fix_717 into 7e4fafc4e2576e843192eddaa36317ca987dd3e0 on savoirfairelinux:dev.

[lingxiaoyang]

@lamontfr Thank you! I rebased in acda830. I'm merging it now.