Merge pull request #64 from Zentific/pid_to_dtb_fix

Bugfix for two issues affecting task lookup in Linux-specific code
remove linux_addr from offset finder tool
- this value is no longer used by libvmi
Merge pull request #65 from bdpayne/linux_addr

remove linux_addr from offset finder tool
Switch reg/mem_access enums to bitfield typedefs
split reg and clear functions
Byte-level memevents