Fiduswriter

**Fixes:**
* Create default citation and document styles in case none are installed
* Give clearer error messages if document template without document/citation styles is loaded.

Main changes of the 3.6 branch

**Features:**
* Document templates
* Initial content for document parts
* Instructions for document parts
* User restrictions on document parts
* Underlined text
* Separators
* Table of Contents
* Document navigator
* Figures/Tables that take less than 100% width in space
* Inline menus for tables
* Image editor
* Admin console: overview over currently connected users and ability to send system messages to them
* Table column width: fixed or auto
* Position (left, right, center ) of tables and figures
* Document title in print/PDF

**Fixes:**
* Allow logging bugs when JS served from subdomain
* Numerous print and exporter issues

**Design:**
* Logo
* Emails
* Inline menus

**Fixes:**
* upgrade revision bibliography correctly

**Fixes:**
* Deal with empty answers or comments that are being submitted

**Fixes:**
* recreate revision

**Upgrades:**
* Django 2.1.5
* Chrome tester => v. 72

**Fixes:**
* Upgrade bleach to 2.1.4
* Upgrade travis settings to run on xenial (travis no longer works)