User flags

The WBU_FLAG field is a 10-character field allowing for ten general purpose user flags with these characteristics:

The first character represents WBU_FLAG1, the second represents WBU_FLAG2, and so on.
Only flags that are used are required in the flag string value. For example, if five flags are required, the flag string should be as follows:
```
YNNYY
```
A space in one of the flag positions indicates that processing is not required for that flag. For example, if WBU_FLAG2 should not be processed, the flag string should be as follows:
```
Y NYY
```
An ampersand (&) in one of the flag positions indicates that the flag should be empty. For example, if there should be no value in WBU_FLAG2, the flag string should be as follows:
```
Y&NYY
```

Note: If there is a previous value in a flag field, the ampersand (&) will remove it.