Add .txt to the common deck file types

fix #1683

Whoops: Fix db schema number

Having token set to not null breaks the use of requireemail=false

Add script to validate schema changes.

Basic assertions about version updates

Travis updates

Server-size fixes for card stacking

Added set focus to description anytime a create dialog is opened

Improved login error message

Fix column widths in rooms list

Avoid crash on dereferencing null pointer

Fix velvet marble theme

fix #1695

link renaming

-`Linking FAQ` --> `How to set a custom picture url`
-updated define accordingly

Having token set to not null breaks the use of requireemail=false in the servatrice.ini as token will be null in this use case.

Changed the default setting to play cards to the stack

CPack: Debian package

Handle more Command_JoinRoom return values

Also, handle all the Command_JoinRoom return values

CMake: Add "test" target