Update ia64sim to 0.5.

Changes in Version 0.4
----------------------
1. First draft of a user manual (doc/ia64user.txt)
2. Systems calls to vprintf and program exit
3. Enhancements to single step and display register commands
4. Trace level command
5. Reset hazards command
6  Various bug fixes

Changes in Version 0.5
----------------------
Supports ELF files created by the Intel IA64 Assembler. Not all relocation
types are yet supported.

(obache)