font size

changed left pad font-size
solved error messages pro

Error message for file errors shows many times , contain all error
messages inside a listbox.
solved errors showing too many times

Error message for file errors shows many times, contained all error
messages in a list .
Before merge
Before commit
Closes #20
Some Changes to the errorwindow.ui layout
Merge remote-tracking branch 'upstream/master'
Validate student number and write errors

Updated the part where we validate our student numbers and added a part
where by a user can save errors on a text file