Fixed the bug that a file gets overwritten if -V is given and no
hash is provided. Fixed the bug that --dry-run leads download
error. Added RequestGroup::createCheckIntegrityEntry() which
correctly creates CheckIntegrityEntry objects and open files based
on -V option and the existence of control file.
* src/AbstractCommand.cc
* src/AbstractCommand.h
* src/ChecksumCheckIntegrityEntry.cc
* src/DownloadContext.cc
* src/DownloadContext.h
* src/FtpNegotiationCommand.cc
* src/HttpResponseCommand.cc
* src/PieceHashCheckIntegrityEntry.cc
* src/RequestGroup.cc
* src/RequestGroup.h
* src/RequestGroupEntry.cc
* src/RequestGroupEntry.h
Implemented BitTorrent/http/ftp integrated download.
I've rewritten lots of files and now some headers have forward
class declarations to reduce compile time.
The implementation is extremely alpha stage, I recommend to use this
for testing purpose only.