More Boost Filesystem v3 fixes, pythondmn NullMutex() removal

+ added support for Boost Filesystem v3 keeping backward compatibility
with v2. Changes (renaming):
    * class path: external_file_string() -> native()
    * class path: file_string() -> string()/wstring()
    * class wdirectory_iterator -> class directory_iterator
+ removed NullMutex() usage in IPKContainer::Init() (new interface).
+ fixed file permission for libSzarp2/protobuf/paramsvalues.proto