make makeSubstitutions() more robust so that batterPos is completely accurate

Sometimes the batterPos cannot be determined by makeSubstitutions(). Usually this is due to a data error. For example, in

```
gid_2013_04_26_pitmlb_slnmlb_1
```

Jeanmar Gomez's playerId is not accurate -- instead Jonathan Sanchez's is listed. In

```
gid_2013_07_10_anamlb_chnmlb_1
```

Brooks Raley's playerId is given as 0.

Not sure how to recover from such errors.

Start by reading makeSubstitutions() and reproducing the batterPos failures for gid_2013_04_26_pitmlb_slnmlb_1 and gid_2013_07_10_anamlb_chnmlb_1. Determine how the incorrect playerId and playerId 0 affect substitution handling; done means batterPos is accurate despite these data errors.

Written by the indexing model from the issue text.