Re: [release] Boost 1.91 RC1 available

Tested successfully on x86 RHEL 9 with GCC 14.3 and 15.2 in C++11, 14 & 17

Most warnings are from Boost.Python which can be avoided by setting 
BOOST_NO_AUTO_PTR (should this become the default now?)
A couple false positives from Boost.Serialization about storing 
`m_buffer.begin()` from uninitialized `m_buffer` which is a 
`boost::array` instance
A few -Wtautological-compare from Url of the form: if 
(!__builtin_is_constant_evaluated()) being used in a non-constexpr function

There is a strange looking check from predef:
     - BOOST_ARCH_WORD_BITS == 0.0.16 : no [6]
     - BOOST_ARCH_WORD_BITS == 0.0.32 : no [6]
     - BOOST_ARCH_WORD_BITS == 0.0.64 : no [6]

While the version number just looks odd, there seems to be an issue: The 
cmdline is

 >  "g++"   -std=c++11 -fvisibility-inlines-hidden -fPIC -m64 -pthread 
-O3 -finline-functions -Wno-inline -Wall -fvisibility=hidden  
-DBOOST_NO_AUTO_PTR=1 -DCHECK="BOOST_ARCH_WORD_BITS == 
BOOST_VERSION_NUMBER(0,0,16)" -DNDEBUG  
  -I"/dev/shm/boost_1_91_0/libs/predef/include"  -c -o 
"bin.v2/check/predef/gcc-14/release/x86_64/cxxstd-11-iso/threading-multi/visibility-hidden/predef_check_cc_0dce3463ac55eb0b457e08d9fad8d57f.o" 
"/dev/shm/boost_1_91_0/libs/predef/tools/check/predef_check_cc_as_cpp.cpp"

which fails with

 > /dev/shm/boost_1_91_0/libs/predef/tools/check/predef_check_cc.h:7:10: 
fatal error: boost/predef.h: No such file or directory

i.e. it adds the submodule include directory, which doesn't exist in the 
release archive, instead of the top-level "."
This might break the architecture checks and one each from Test and VMD

- Alex

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