[Aux] More forwards.
[API] Verbose logger now can keep bound verbosity level and filter by it.
[Bug Fix] Scoped attribute's destructor is now virtual.
[GCC 4.4] GCC 4.4. hasn't implemented `std::lock` and others.
[Aux] Tiny renaming.
[Aux] Compatibility with scoped guards.
[Aux] Now synchronized wrapper knows some things about verbose logger.
[Bug Fix] Found and destroyed infinite recursion bug.

Scoped attributes thread specific pointer's deletion function hasn't been properly initialized when log has been constructed via move constructor.
[Code Style] Tiny styling.
[Hotfix] Not only verbose logger can open record with some verbosity level.