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Added quotation to sql identifiers in all lesson functions and get_timetable()
Added basic layout for the site header,
changed sql identifier quotation to work with MySQL
Merge commit '3fcc6606c3ec1aa7ebddb0fd8e34b14e0016fe3b'
A little change to the site_header, smo_user class
Added extended_sessions to the databse diagram
Updated workbench model, implemented password-validating smo_user constructor
Merge commit '0e67a2272257f777b2762e9c5fbed9dd71b07f13'

Conflicts:
	libsmo/src/smo_user.cpp