Improve ProcessController<->Debugger integration.

- Clicking on a team item in Threads and CPU Usage now offers the option
  to debug the team in addition to killing it.
- Both the aforementioned option and the previously existing thread
  debugging option now invoke Debugger directly instead of simply
  invoking debug_server via debug_thread().

Implements #9768.
Incorrect checking of already set double indirect blocks

Wrong variable usage in inner loop caused some double indirect stream
runs to be checked twice when block size was smaller than
DOUBLE_INDIRECT_ARRAY_SIZE, while some were incorrectly marked as
unallocated in the bitmap.

Signed-off-by: Axel Dörfler <axeld@pinc-software.de>
bfsinfo: Added double indirect block output.
Terminal: Center Find window in term window frame

... instead of positioning it under the mouse pointer as suggested
by Axel.
libroot: make all areas executable for old binaries

 * If at least one image is either B_HAIKU_ABI_GCC_2_ANCIENT or
   B_HAIKU_ABI_GCC_2_BEOS almost all areas are marked as executable.
 * B_EXECUTE_AREA and B_STACK_AREA are made public. The former is enforced since
   the introduction of DEP and apps need it to correctly set area protection.
   The latter is currently needed only to recognize stack areas and fix their
   protection in compatibility mode, but may also be useful if an app wants
   to use sigaltstack from POSIX API.
Terminal style fix, spaces around binary operator
Terminal: Move secondary windows back in screen

For the Window title and tab title edit windows there was already code used to
move a window that had gone out of the screen frame back in.

I generalized this code by turning it into a _MoveWindowInScreen() method
and then called it in 3 places, the original 2 cases as well as the Find window.
We might want to move this method into BWindow if this is something we'd like
to use it for windows in other applications, but this solves the problem in Terminal
for now.
if_nameindex() wasn't retrieving interface index. Fixed #9770
Style cleanup and fix a possible endless loop
Extend Table/TreeTable's interface.

- Add NotifyNodesCleared() hook to table model as a shortcut for
removing all rows.

- TreeTable::_RemoveChildRows() now recognizes the special case of the
above and optimizes it by calling BColumnListView::Clear() rather than
removing each row individually.

- Add TableModelReset()/NotifyTableModelReset(). This notification is
used to tell the underlying table that a full rebuild is needed due to
the model changing completely.
Cleanups/optimizations for ImageFunctionsView.

- Get rid of the functions array as we no longer really needed it except
to sift duplicates. The latter function is now done simply by keeping a
set of already seen function addresses, and skipping entries which fall
in said category.

- Use NotifyNodesCleared()/NotifyTableModelReset() as appropriate.

- Remove now-unused sorting functions.

Combined, these changes significantly reduce the overhead of switching
the active image, which was produced observable lag when either choosing
another image in the Images list, or when stepping into/out of a
function resulted in an image change.
VariablesView: Use Notify{NodesCleared,TableModelReset}().
Adjust menu field's menu bar height in auto mode

On IRC diver pointed out to me that KeymapSwitcher had a menu field that
was drawing as just a line since my recent change to BMenuField. I did a
little research and discovered that this was because the menu field in
KeymapSwitch was not using the layout APIs and it's frame rect was set to
0 height.

I did a little more research and experimented with menu fields in
BeOS R5. I discovered that in R5 if the menu field is set to auto-size
mode then the menu bar inside ignores the height of the menu field frame
and uses the BMenuBar's preferred height instead.

So, I adjusted the BMenuField code in Haiku accordingly. This should make
Haiku match the behavior of BeOS R5 in auto-size mode. For fixed-size mode
it should also work the same, although some more testing is needed to
see if there are any regressions there.
Remove NotifyNodesCleared() again.

- For various reasons this one can be error prone, since it relies on
the model being able to provide the correct row count, which won't be
the case if the subclass calls it after having already removed all its
nodes.

- Optimize Table's RowsRemoved() similarly to TreeTable's for the remove
all rows case.
VariablesView: Switch back to NotifyNodesRemoved().
ImageFunctionsView: Switch back to NotifyNodesRemoved().
Rework source path parsing.

- As we parse the image's function list, we now track the last source
file we encountered. If it's the first time we encounter the current
file, we parse its source path components up front and then simply walk
the parsed list in order to add the function to its appropriate place in
the model, rather than the previous recursive approach.  This allows us
to reuse the parsed component list for subsequent functions in the same
source file rather than having to reparse the path on every iteration.

- Refactor GetFunctionPath() to make use of the new
_GetSourcePathComponents() parsing function.

Should further improve the time needed to change the active image.
agp_gart: switch to phys_addr_t as suggested by Urias and Axel.

* this is a follow-up to hrev45621
Extend CpuState interface.

- Add SetInstructionPointer() to allow an outside updates.
- Add Clone() to request a duplicate of the current state object.
- Add UpdateDebugState() to take a debug cpu state structure matching
the current architecture and update its registers with the values from
the cpu state object.
Add MSG_THREAD_SET_ADDRESS and implement handling.