Tag the HORT as V1.0.14.
Remove the old prebuilt Doxygen Makefile and html directory.
Update autotools build system to handle Doxygen generation. There is now
docheck3 also depends on the output from docheck1.
When faced with C++14-isms in the code and GCC-16, autoconf falls back too
Replace std::bind2nd with simple lambdas.
Replace the deprecated std::mem_fun with std::mem_fn.
Add 64-bit RISC-V and Loongarch architectures.