Removed CPLUSPLUS_BEGIN/END_NAMESPACE and replace CPLUSPLUS_USE_NAMESPACE with `using namespace CPlusPlus;'

these missed the handleExecContinue() callback, so they got missed last
time. added both callback and flag, and some more glue to the gross
isBogus hack.

these are a mess anyway

Reviewed-by: hjk

_HAS_ITERATOR_DEBUGGING asserts can cause the debugger to be in an
inconsistent state and should thus be avoided. Add checks on the
underlying red/black tree structures using friend helper classes.

it is alread used for the error cases anyway.
one could introduce an intermediate state InferiorRunningFailed, but
this doesn't seem to bring any advantages.

Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

You now get the function parameters as a completion suggestion when
declaring or defining a function. The tooltip for function calls
is unchanged.

Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>
(cherry picked from commit 202fef42)