<th> now gets class="col-X" - plus added col-X documentation

Refs #209

datasette/app.py

@@ -522,7 +522,7 @@ class RowTableShared(BaseView):
             # or to the simple or compound primary key
             if link_column:
                 cells.append({
-                    'column': 'Link',
+                    'column': pks[0] if len(pks) == 1 else 'Link',
                     'value': jinja2.Markup(
                         '<a href="/{database}/{table}/{flat_pks_quoted}">{flat_pks}</a>'.format(
                             database=database,

datasette/templates/_rows_and_columns.html

@@ -2,7 +2,7 @@
     <thead>
         <tr>
             {% for column in display_columns %}
-                <th scope="col">
+                <th class="col-{{ column.name|to_css_class }}" scope="col">
                     {% if not column.sortable %}
                         {{ column.name }}
                     {% else %}