Remove old/unused code

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
CA-120525: Open VHD files RO where possible

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Merge pull request #4 from simonjbeaumont/ca-120525

Open VHD files RO where possible
Update CHANGES for 0.6.2 and 0.6.3
Merge pull request #3 from simonjbeaumont/remove-dead-code

Remove old/unused code
vhd-tool: 'serve' now accepts raw inputs as well as chunked and NBD

It will also infer the destination size using BLKGETSIZE64 since the
destination will often be a block device.

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
vhd-tool: in 'serve' (receiving data) open the destination read/write

Otherwise writes fail with EBADF (unsurprisingly)

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Merge pull request #5 from djs55/serve

vhd-tool serve fixes
Release 0.6.4