add PTRACE_PEEKSIGINFO to ptrace.h added in linux-v3.10 commit 84c751bd4aebbaae995fe32279d3dba48327bad4 using stdint.h types for the new ptrace_peeksiginfo_args struct
add missing ptrace requests and options to sys/ptrace.h
implement ptrace syscall wrapper (untested)
initial check-in, version 0.5.0