Merge commit 'egit/spearce/transport'

Merge commit 'egit/spearce/transport'

* commit 'egit/spearce/transport': (82 commits)
  Use the Eclipse network proxy configuration for HTTP connections
  Use the Eclipse UserInfoPrompter to support SSH prompts
  Enable HTTP proxy on jgit command line using cURL compatible http_proxy
  Show transport errors received while listing branches in clone wizard
  Don't put borders on groups in the clone wizard
  Include the URL we cannot connect to in HTTP transport
  Don't discard walker based fetch error information
  Define static ASCII encoded type strings for ObjectId computation
  Use getCachedBytes in ObjectLoader.getId when computing the ObjectId
  Change UnpackedObjectLoader(byte[]) to only throw CorruptObjectException
  Report cause of TransportException when running in command line mode
  Fix weird line wrapping in WalkFetchConnection
  Fix warning in ObjectWriter about local variable hiding a field
  Honor refspecs passed to our command line Fetch client
  Add dumb transport support for sftp:// style URLs
  Add support for FTP dumb transport to the HTTP implementation
  Implement http and https fetch transport support
  Translate ssh://user@host/~foo/bar to be relative to home directory
  Allow UnpackedObjectLoader to be called on an already read object
  Make PackIndex public and expose PackIndex.hasObject
  ...