MyCyma

[fix] improve password validation #2

[fix] improve password validation

[evol] redirect to home page after logout, instead of login page

[fix/evol] forgot new files in the previous commits and check admin status to access user management

[evol] updated URLs in 'About' submenu

[evol] created a simple logon system, protected admin pages, and added a logon indicator/link (no user management yet, only a deadend entry in the menu if admin)

[cosmetic] center artwork image in their frame in the arwork admin list

[fix] worked around artwork list default sort not enforced

[fix] added 'selected' parameter to artwork size generic selector and pass currently selected size in artwork edit page (closes #1)

[fix] ensure displaying final image in the 'lastest 10 artworks'