Fix inclusion of header files in coregrind. No pub_tool_*.h should be
included here.
Added pub_core_poolalloc.h and renamed pub_tool_inner.h to pub_core_inner.h.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13548 a5019735-40e9-0310-863c-91ae7b9d1cf9