Implement "user" program

[Patryk Kubiak]

There is a need to implement a core space program named "user". It should allow for managing users in the system. It includes:

User creation:

user --add [username] [permissions]
Where permissions are rwx
(The program should ask about password twice, that should be displayed as stars (*))

User delete:

user --delete [username]

Changing password:

user --edit-password [username] 
(The program should ask about old password and new password twice, that should be displayed as stars (*))

Changing permissions:

This should be available only for admin users

user --edit-permissions [username] [permissions]
Where permissions are rwx

[Patryk Kubiak]

Mikolaj has finished this program

[Patryk Kubiak]

Removing component: core-space program (automated comment)