Upgrade to fullCalendar 3.9.0

Squashed commit of the following:

commit cd7c726b57edaa7997e0ebed27b5b5ec8ae7fb1e
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Tue Jan 22 13:52:35 2019 +0000

Remove leftover code

Agenda sections and fisheye view.

commit 8b2203adfc03746872183e2d211ad1fe1798730e
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Tue Jan 22 12:23:11 2019 +0000

Fix duplicated requests on using Next/Prev buttons in Agenda view

commit 2dff07962566c13ef38703cc23d4f6b234b80303
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Tue Jan 22 11:34:16 2019 +0000

Increase font-size for .fc-event

commit 9bb48ec3fa1d3a4eb255870b1a91ace55dbc5b95
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Fri Jan 18 12:10:33 2019 +0000

Fix re-fetching updated event in quickview mode

commit 841815f5b1a5581f607bd5ee05e15e9c8476f4bc
Merge: ffe9c0c7 315079c8
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Fri Jan 18 11:43:19 2019 +0000

Merge branch 'master' into dev/fullcalendar-upgrade

commit ffe9c0c7f7efd217e01cdcaed23e135058ef65b2
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Fri Jan 18 11:41:59 2019 +0000

Fix events re-rendering after "Print descriptions" option change

commit bc48cd6639fd50f7e5236945ec9661c11d614595
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Fri Jan 18 11:30:38 2019 +0000

Fix event color on hover in print mode

commit 0776636fd60258f05aa5f1877c365e040bc1fa7b
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Fri Jan 18 10:07:41 2019 +0000

Fix including eye.svg

commit 7cc525e4e92407069e22a59c9976ded24cabe940
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Fri Jan 18 09:50:34 2019 +0000

Elastic support for new fullCalendar

commit 3efc8d038986859a388dd7653ab00a1f0ee82914
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Thu Jan 17 07:47:59 2019 +0000

Remove now indicator on calendar print

commit a1d018875bc0065f372b6483ff3b1be13f4c787c
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Wed Jan 16 13:40:11 2019 +0100

Calendar agenda view and printing

Note that agenda's smart sections feature is not implemented (yet)
as it does not exist in fullCalendar (it was a Kolab's customization).

commit ea873a9589a11a33ee49f27abf9ac30af9a1690b
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Tue Jan 15 12:18:21 2019 +0100

Calendar Agenda and searching fixes

commit fb0c3436a34e4507ee454d16cc257be33659e3da
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Fri Jan 11 13:59:29 2019 +0100

Varius calendar fixes and cleanups

commit d45f3439b9e41fe4d25e647949b37255ebfc5068
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Wed Jan 9 13:22:24 2019 +0100

Fix various Larry skin regressions after fullCalendar upgrade

commit 3373fff6b3f73a05811efead66c7b5747adb2ba7
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Wed Jan 9 10:51:16 2019 +0100

Fix .fc-today style

commit 5718fd40e34d93b1c57f529bb53544ce156a1913
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Wed Jan 9 10:31:22 2019 +0100

Fix various date calculation issues after fullCalendar upgrade

- allDay flag must be boolean
- allDay event's end date must be exclusive

commit d08e8a8a3b4f97781cd1980b714886507d129cf5
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Tue Jan 8 11:39:10 2019 +0100

Fix date/time format issies and inconsistencies, remove confusing config

commit b0196c7ff1d71149fec5fd619220faf9f5f6a612
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Mon Jan 7 15:46:51 2019 +0000

Fox some small issues after fullCalendar update

commit c7b561f19daacdd72853a300e22fdc025bf3db28
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Mon Jan 7 13:22:57 2019 +0000

Fix handling 'source' argument in load_events request

commit 59fc3c816887a2aa591e4c4237e2f4fff131bbb0
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Mon Jan 7 12:26:04 2019 +0000

Fix including moment.js

commit eb85d762c75cf11fcbe1f40010bef7d4794be23a
Author: Aleksander Machniak <machniak@kolabsys.com>
Date: Fri Jan 4 16:12:33 2019 +0000

Upgrade to fullcalendar 3.9.0 - Part I

Just started, still many issues, no printing, no elastic, no agenda view