Eliminate more ungrammatical combinations

[jcrippen]

There are several combinations of prefixes that are probably ungrammatical. One particular issue is the any combination of g̱- modality with i- stative without irrealis u-. All the questioned forms need to be reviewed to verify whether they are grammatically possible or not, and those that are not need to be starred with ‘⁎’.

For comparison, see the tables with fourth person human du- for impossible combinations.