Resolve "Compilation fails opal@master%gcc@11.3.0 ^amrex@18.07"

Closes #804

See merge request !661

Resolve "Compilation fails: std::shared_ptr not defined"

Closes #802

See merge request !660

Resolve "replace boost::filesystem with std::filesystem"

Closes #798

See merge request !655

Resolve "replace boost::chrono with std::chrono"

Closes #799

See merge request !657

Merge branch '801-type-__float128-is-not-supported-by-clang-on-mac-s-with-apple-silicon-cpus' into 'master'

Resolve "type __float128 is not supported by Clang on Mac's with Apple silicon CPUs"

Closes #801

See merge request !659

Resolve "fixes/cleanup for compiling on macOS 14.4 and Clang 15 (Xcode 15.3)"

Closes #800

See merge request !658

type __float128 is not supported on Mac's with ARM64 CPU

Resolve "replace boost::scoped_ptr with std::unique_ptr"

Closes #797

See merge request !654

Resolve "ippl/test/PwrSpec/testPwrSpec.cpp: ambiguous call to reduce()"

Closes #796

See merge request !653

Resolve "Regression test broken: string constant duplicated"

Closes #795

See merge request !651

Resolve "OutputPlane"

Closes #793

See merge request !648

Resolve "VariableRF, FFA, Offset and MultipoleT: unify units internally"

Closes #787

See merge request OPAL/src!643

Resolve "Compile error"

Closes #789

See merge request OPAL/src!645

Resolve "PyOpal cmake option"

Closes #788

See merge request OPAL/src!644

Resolve "Unused degrader attributes"

Closes #786

See merge request OPAL/src!641

Resolve "Regression tests broken"

Closes #780

See merge request OPAL/src!642

Resolve "h5 file initialization"

Closes #785

See merge request OPAL/src!640

Resolve "Define AMR refinement criteria as scoped enum"

Closes #783

See merge request OPAL/src!637