Version 0.5.6 Beta 1: Compatibility and partial-inclusion fixes

[eyalroz]

This release has no new functionality over v0.5.6, only bug/compatibility fixes.

C++14-and-later compatibility fixes

• optional fixes vis-a-vis later C++ standard versions #415: Resolved incompatibility of std::optional/std::experimental::optional with the internal poor_mans_optional.
• std::experimental headers for optional and any mistakenly included within namespace cuda #416: corrected placement of inclusion of std::experimental::optional

Other changes

• Occurrences of non-::-qualified std namespace have snuck in again #411: Add :: prefix to occurrences of std:: (which snuck in again in recent versions; these potentially clashe with NVIDIA's standard library constructs)
• Fix up dependencies and includes #413: Added missing intra-library #include directives which were masked when including all APIs, but not when including individual headers. Also, removed inappropriate inline decorators from declaration-only lines.
• Some context override gadgets are named "set_device_..." #420: Internal renaming
• fix up relations of memory.hpp and multi_wrapper_impls/memory.hpp #417, fix up relations of memory.hpp and multi_wrapper_impls/memory.hpp #417: Internal placement of functionality in header files (files in cuda/api/ vs in cuda/api/multi_wrapper_impls).
• bandwidthtest doesn't include <iostream> #412: bandwidthtest now includes <iostream> on its own.
• Move pci_id_impl.hpp into the detail folder #409: Moved pci_id_impl.hpp into the detail/ subfolder (and renamed it)

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This discussion was created from the release Version 0.5.6 Beta 1: Compatibility and partial-inclusion fixes.