flow horizontally in tables to save vertical space

[mattfenwick]

Fixes #106

Example:

+--------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
| TCP/80 |   X/A   |   X/B   |   X/C   |   Y/A   |   Y/B   |   Y/C   |   Z/A   |   Z/B   |   Z/C   |
| TCP/81 |         |         |         |         |         |         |         |         |         |
| UDP/80 |         |         |         |         |         |         |         |         |         |
| UDP/81 |         |         |         |         |         |         |         |         |         |
+--------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
| x/a    | X X X X | X X X X | X X X X | X X X X | X X X X | X X X X | X X X X | X X X X | X X X X |
+--------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
| x/b    | . X X X | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . |
+--------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
| x/c    | . X X X | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . |
+--------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
| y/a    | X X X X | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . |
+--------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
| y/b    | . X X X | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . |
+--------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
| y/c    | . X X X | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . |
+--------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
| z/a    | X X X X | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . |
+--------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
| z/b    | X X X X | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . |
+--------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
| z/c    | X X X X | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . | . . . . |
+--------+---------+---------+---------+---------+---------+---------+---------+---------+---------+