Arodur itself on longer depends on C/C++ locale for saving/loading sessions.
However, the Localeguard is kept for 3rd party plugins: Reset the C locale
to "C" to enforce consisten numerics and portable sessions as well
as verify that no plugin changes the C++ locale.
* use explicit operator<< and operator>> that in turn use PBD::EnumWriter when serializing and deserializing to/from rc files
* adds scrolling in mixer window (from 2.X)
* BBT math stuff - untested, but basically operational
* move LocaleGuard into its own file(s) in libs/pbd
* Tempo now uses nframes64_t everywhere (except for sample rate values)
* as in 2.X, use mkstemp and hack to avoid temp file nonsense, and remove erroneous free() from disk stats output
git-svn-id: svn://localhost/ardour2/branches/3.0@5961 d708f5d6-7413-0410-9779-e7cbd77b26cf
