New Tanger release (0.6.0)

A new version of Tanger is available. It contains a couple of enhancements and several bugfixes. If you encounter any bugs or have questions, just check the bugtracker, send an email, and I'll have a look at the problem. Thanks go to Haggai Eran for reporting many of the bugs fixed in this release.

The new Tanger version requires LLVM 2.2 (in turn, old versions do not support LLVM 2.2). LLVM 2.2 creates faster code (e.g., linkedlist single-thread performance increases by 30%).

New features (incomplete list):
- Support for indirect calls (aka function pointer calls)
- Calls can be marked as to not be instrumented. Can be useful as a workaround but is dangerous.
- More statistics, warnings/errors messages, and safety checks

Fixed bugs (incomplete list):
- Fixed malloc/free transformation
- Fixed some Makefile issues
- Incorporates fixes posted on the mailing list