Adds unicode arrows to sorted dataTables.
Fixes to supplements and images.
Fixes image layout bug.
Changes to .content-wrapper name.

.content-wrapper will become .primary-content-wrapper to distinguish which section of content it is in the template. In the meantime, .content-wrapper and .primary-content-wrapper will co-exist.
Fixes narrow layout bug in .sidebar-wrapper.

Increases .sidebar-wrapper to fill the full width of the allotted space. Also clarifies the proper margins.
Adds viewport meta tag to CSS.