Enhanced CTorrent Code

New staging files created due to size limit must be linked correctly.

Buffer was not freed when using -a.

Limit max staging file size.
Set constants for other btfiles values.
Buffer was not freed when using -a.

m_stagecount goes negative so directories aren't deleted

Don't print file completion details if no data present.

Create only files specified for downloading.

Update identifier names

Prevent checking pieces in all alloc modes if no files existed.

Better allocate options selection

Indicate when a file is being created, even when trying to use sparse files.