#170: Least fixup

[ikedas]

This is the first fixup to move to Foundation 6. See issue #170.

These incompatible changes between Foundation 5 and 6 have been followed:

• Foundation could not be loaded.
• Error dialog was broken.
• Dialogs to display messages (delivery report and so on) was broken.
• Dropdown menu (drilldown menu on mobile environments) was broken.
• Changes in CSS (but see below).

Changes/Improvements:

• Get rid of redundant list menu. Previously in environments without CSS/javascript, list menu was shown twice.
• Login form is no longer shown in menu bar: Link to loginrequest page is shown instead.

Known bugs:

1. As F6 uses inline-block as items of menu bar (top bar) instead of list-item by F5, spaces between items are rendered.
2. On narrow display with desktop mode, top bar may be overlaid on logo.
   
3. Icons on home page are warped.