add func

void FCB::closefile()
void FCB::flushfile()
Merge branch 'master' of github.com:olshtein/miniProjectFileSystem

Conflicts:
	FMS5774_8865_5366/FMS5774_8865_5366/Disk.cpp
	FMS5774_8865_5366/FMS5774_8865_5366/Disk.h
	FMS5774_8865_5366/FMS5774_8865_5366/FCB.h