cindex does not follow and index symlinked paths

```
What steps will reproduce the problem?
1. Create some symlinks to some source code in a directory.
2. Index that directory.
3. Search for symbols which are only in symlinked source files.

What is the expected output? What do you see instead?

I expect to see symlinked files listed by csearch.
csearch only indexed regular files.

What version of the product are you using? On what operating system?

0.1 on Mac OS X 10.6

Please provide any additional information below.

Maybe additionally provide an option to restrict or follow symlinks to certain
filesystems for better control.
```

Original issue reported on code.google.com by `manpreet...@gmail.com` on 7 Feb 2012 at 4:00