CMake Nightly Date Stamp
Help: Document non-use of std::set::insert.

As found in commit 8e7c207e (Use a manual loop to insert into
set::set., 2012-09-15).
Help: Note that std::string::clear may not be used.

As found in commit 519c0a5d (Can't use std::string::clear() in
cmake., 2012-09-15).
Merge topic 'disallowed-cxx-subset' into next

d135d3d7 Help: Note that std::string::clear may not be used.
ce34beaa Help: Document non-use of std::set::insert.
0183ede2 CMake Nightly Date Stamp