[profile-stdlib][patch] Stdlib advisory tool implemetation

[Paolo Carlini]

Paolo Carlini wrote:
> 4- Afterwards, there are smaller issues, like I'm seeing many 
> non-"uglified" symbols in headers included by the user-code, this is a 
> no-no, *everything* (besides the names of functions, classes and 
> constants specified in the Standard, of course) must begin by __ or _ 
> + Capital (macros included, really there are no exceptions).
In fairness, I see now that most of the issues are in the profile 
versions of has_map, hash_set, etc (but I also see an 
insert_return_type, which we don't want): in any case, please leave 
stuff in ext/ alone, that's legacy code, only minimally maintained these 
days, not worth wasting time.

Paolo.