batch.list to execute current folder

in the current syntax of the batch.list, the file need to be placed in the parent folder of the simulation testcase:
```
testcases:
    batch.list
    adder
        tb.sv
        sources.list
```

while it would be more practical to have
```
testcases:
    adder
        tb.sv
        batch.list
        sources.list
```

so that in batch.list the folder is `.` or `./`
