Hi Yuan!

There were some regressions with the new indent-line-function - see
attached patch.  We need the point, not the indentation, and the
save-excursion is actually needed.

consider:

```
foo({
  thing: 1,
                tho|ng: 2, // <--- point is |
})
```

if you indent now you want to end up like this:

```
foo({
  thing: 1,
  tho|ng: 2, // <--- point is |
})
```

or if 

```
foo({
  thing: 1,
|thong: 2, // <--- point is |
})
```
You want to end up like this:

```
foo({
  thing: 1,
  |thong: 2, // <--- point is |
})
```

This patch addresses this :-)

In addition there was a bug where the parent-bol didn't indent
correctly, this should also be fixed now.

Thanks again, Yuan!

Theo