New field added to table User for password recovery control

I have added the field pwd_timestamp, necessary for the password
recovery reasons. It can be null.
Interface changes and new styles

I have commited in this change new files for style purpose and ONLY the
visual part that I developped. The validation part that has been
developped is not included in this commit since it is not my field of
work and I would like Tushar, Shilpa or Rashmi to validate it