booknouse

avoid mulitple redefinition when include from different .c/.cpp files.

2

when #include "headers/codecfactory.h" from two cpp in a project, meet "multiple definition of xxx"

psf.cc,remote redundant close in destructor,because it would be called in ~PSFFile.psfile.cc, use new validate method, and add m_buffer's NULL judgement to Make the close method reentrant(cause crash).psfinternal.h, add ~PropertyBlock method,...