STLSoft 1.9.88 imminent

I'm just preparing a new release of recls, and in the process have needed to enhance winstl::basic_findfile_sequence, adding a new throwOnAccessFailure flag, which (as should be obvious from the name), causes an exception to be thrown in the event of access failure. This will allow consistent behaviour between recls (C/C++) and the new recls 100% .NET library.