Indent comments appropriately.

Comments in SAS are indented as follows:

```
proc nlmixed data=one; 
   ...
  ktol=exp(lk); /* comment */
     ec50=exp(lec50);
```


I think it should be:

```
proc nlmixed data=one; 
   ...
  ktol=exp(lk); /* comment */
  ec50=exp(lec50);
```
Merge pull request #59 from mlf176f2/patch-4

Indent comments appropriately.