Allow Multiple Table Generation

[billdenney]

As described in #10, some tables can get long and unwieldy. It would be helpful if tttable could generate multiple tables from a single input like:

Input:

V1	V2	V3	V4	Summarizer	Value
A	E	G	I	Count	1
A	E	G	J	Count	2
A	E	H	I	Count	3
A	E	H	J	Count	4
A	F	G	I	Count	5
A	F	G	J	Count	6
A	F	H	I	Count	7
A	F	H	J	Count	8
B	E	G	I	Count	9
B	E	G	J	Count	10
B	E	H	I	Count	11
B	E	H	J	Count	12
B	F	G	I	Count	13
B	F	G	J	Count	14
B	F	H	I	Count	15
B	F	H	J	Count	16

I'd love to be able to see something like the following (or other variants)

V1 = "A":

|   |    G    |    H    |
|   | I  | J  | I  | J  |
| E | 1  | 2  | 3  | 4  |
| E | 5  | 6  | 7  | 8  |

V1 = "B":

|   |    G    |    H    |
|   | I  | J  | I  | J  |
| F | 9  | 10 | 11 | 12 |
| F | 13 | 14 | 15 | 16 |