DynamicView - remove restrictions to std::is_trivial types and value_type is power of two

[ndellingwood]

@bathmatt needs these restrictions lifted for his application.

Referencing past issue #690 where some discussion occurred regarding performance before changing the implementation of the DynamicView to remove use of the MemoryPool and requiring the max number of blocks to be fixed.

In that issue, @bathmatt was using trivial types and able to work within this restriction, but now requires ability to use the DynamicView with non-trivial types. Since the resize method resize_serial can only be called outside of a parallel region, the past discussion about needing to set a lock around the resize should no longer be a concern.

[ndellingwood]

@bathmatt - I checked with @ibaned and @dsunder about lifting the std::is_trival check. Doing so can cause problems depending on why the object is not trivially copyable. We can lift the restriction, but with documented assumption that the type is trivially copyable, and if not than the use will be somewhat at your own risk. Could you provide the struct or type that does not pass this check?

[ndellingwood]

PR #1592 issued