[PATCH] Miscellaneous debug mode fixes

[Douglas Gregor]

Here are the (minor) debug mode fixes I promised. I know of no other bugs in 
the implementation, but I'm sure we'll find some :)

Tested on i686-pc-linux-gnu; no regressions in the libstdc++ test suite in 
either debug or release mode. The new test case bits falied before, but pass 
now.

	Doug

2003-11-13  Douglas Gregor  <gregod@cs.rpi.edu>

	* docs/html/debug.html: Users are allowed to specialize in
	namespace __gnu_debug, unlike in the Apple version of the debug
	mode. Clear up a confusing double-negative. Note that
	std::basic_string does provide extra debugging capabilities, but
	not safe iterators.
	* include/bits/basic_string.tcc: Make sure there's never an
	ambiguity when calling __is_null_pointer. 
	* include/debug/deque: (deque::erase) Properly handle invalidation
	when erasing at the end of the deque.
	* include/debug/vector: (vector::swap): Swap _M_guaranteed_capacity. 
	(vector::clear): Set the guaranteed capacity to 0.
	* testsuite/23_containers/deque/invalidation/4.cc: (test04): Test
	iterator invalidation when erasing at the end of the deque.
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