redesigned top nav
[sysadmin] redesign: move nav from the top to the left
[sysadmin] added missing 'sysadmin/base.html'
[side nav] modified icons
added default avatar
[home] redesigned side-nav. rm border-top of header
[group, organization] redesigned the side nav
[group list] redesigned it
added top-info-popup for 'group' in top nav
[top grp info popup] rm 'new group'
redesigned right-panel hd, modified side-nav, top-grp-info-popup, <th> ...
improved user-info-popup & top-nav-grp-info popup
[top nav] improved 'groups' nav
improved ui, deleted sf_font2
improved ui
modified ui of wiki-index hd
improved side nav for sysadmin & grp
modified ui of button
modified ui of checkbox
[top nav] improved grp info popup