Implement per-task virtual memory limitHEADmaster

  * doc/mach.texi: add a "Memory Limitations" section to document the new interfaces.
  * include/mach/gnumach.defs: (vm_set_size_limit) new routine
    (vm_get_size_limit) likewise
  * kern/task.c: (task_create_kernel) if parent_task is not null copy virtual memory limit
  * tests/test-vm.c: (test_vm_limit) add test for the new routines
  * vm/vm_map.h: (struct vm_map) new fields size_none, size_cur_limit and size_max_limit
    (vm_map_find_entry) add new parameters cur_protection and max_protection
  * vm/vm_map.c: (vm_map_setup) initialize new fields
    (vm_map_enforce_limit) new function
    (vm_map_copy_limits) new function
    (vm_map_find_entry) add protection and max_protection parameters.
    call limit enforcer function
    (vm_map_enter) likewise
    (vm_map_copyout) likewise
    (vm_map_copyout_page_list) likewise
    (vm_map_fork) copy parent limit to the new map and compute and set size_none of the new map
  * vm/vm_user.c: (vm_set_size_limit) new function
    (vm_get_size_limit) likewise
  * xen/grant.c: update call to vm_map_find_entry to pass protection parameters
Message-ID: <0b71f4f89b7cc2b159893a805480d7493d522d60.1758485757.git.dnietoc@gmail.com>

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