Add answers and errors, remove exceptions
Add references to Errors in Answers
Add references to FrontError in Errors
Avoid exceptions : start refactoring

CheckRights, UserTable, StreamTable, and methods in Process for
stream/user creation and pulling events should be covered
Finish refactoring : EvernestFront now builds
Refactor unit tests : branch is ready to be merged
Merge remote-tracking branch 'origin/master' into AnswersWithoutExceptions

Conflicts:
	EvernestFront/EvernestFront/EvernestFront.csproj
	EvernestFront/EvernestFront/Process.cs
	EvernestFront/EvernestFront/SourceTable.cs
	EvernestFront/EvernestFront/Stream.cs
	EvernestFront/EvernestFrontTests/ProcessTests.cs
Add IdentifyUser method
Add password management
Factor User password setter
Add a way to change user passwords
Update interface-front-web.md
Add unit tests for password handling
Remove invalid references to exceptions in comments
Overload AddUser to allow a new user to choose the password
Change StreamController (add Answer object handling)
Merge remote-tracking branch 'origin/AnswersWithoutExceptions'
Merge branch 'master' of https://github.com/Evernest/Evernest