[lmi] wx_test_create_open.cpp

[Greg Chicares]

// ERASE THIS BLOCK COMMENT WHEN IMPLEMENTATION COMPLETE. The block
// comment below changes the original specification, and does not
// yet describe the present code. Desired changes:
//  - Put all files in 'gui_test_path'.

/// Create, save, and reopen a file of each available type.
///
/// Validate each tested operation, then erase the file.
///
/// Put all files in 'gui_test_path'. In theory, they'll all be
/// deleted automatically, but in practice the program could crash.
///
/// Skip file types that are unavailable in context. For example,
/// '.txt' is available only with '--ash_nazg'.