Code Cleanup: Compiler nits

.. fix further XCode semantic warning messages (still some left)
.. WIN32 gcc builds
Code Cleanup: ? and + operator precedence warnings

.. in RideImportWizard resizing .. nasty bit of code.
Code Cleanup: Workout Wizard

.. semantic warningss on Xcode regarding default constructors
Code Cleanup: Power Hist

.. static const in class GNU extension.
Code Cleanup: RideFileCache

.. static const in class a GNU extension and not used anyway.