Relative error bound results in out-of-bounds access after zfp_stream_maximum_size

Nobody has claimed this yet.

@treigerm and I are trying to use the relative error bound as suggested in the FAQ:

```
minbits = 0
maxbits = 0
maxprec = p
minexp = ZFP_MIN_EXP - 1 = -1075
```

However, in https://github.com/LLNL/zfp/blob/4baa4c7eeae8e0b6a7ace4dde242ac165bcd59d9/src/zfp.c#L743-L785

this configuration results in an invalid capacity, which produces an out-of-bounds access soon after:

```
maxsize = 0;
maxbits = 9; // float
maxbits += values - 1 + values * p;
maxbits = MIN(maxbits, zfp->maxbits=0);
// maxbits is now 0
maxbits = MAX(maxbits, zfp->minbits);

maxsize = ZFP_HEADER_MAX_BITS + blocks * maxbits;
// maxsize is just ZFP_HEADER_MAX_BITS
```

@lindstro How should we compute the capacity when using the relative error expert mode?

Start with the relative-error expert-mode settings in the FAQ and src/zfp.c around lines 743-785, then trace zfp_stream_maximum_size with the reported minbits, maxbits, maxprec, and minexp values. Reproduce the invalid capacity and out-of-bounds access, and establish what capacity behavior should be expected for this configuration.

Written by the indexing model from the issue text.