[[JENKINS-16301] Use a buffered input stream to get somewhat better performance also from Maven archiving.
Introducing Util.getDigestOf(File) as a convenience.

Node monitoring should run in parallel to reduce the total round-trip
time in large instances.

[FIXED JENKINS-17330] FilePath.installIfNecessaryFrom should avoid routing download over remoting channel.

The updated version uses the locally cached timestamp, '.timestamp', to set the
'If-Modified-Since' header. 304 Not Modified responses are dealt with by
aborting the installation.

make AbstractInterceptorCallableWrapper a static inner class for usability in plugins

fix confusion in my french-to-english buggy translator :P

The actual meat of the change is in remoting.

Add a new overload method to list files that include the files that ant excludes by default.

Previously, the untar code tries to set the last modified time and mode
on every untarred file.  However, if the tar contains a broken symlink,
or a symlink that points to a file that has not been untarred yet, the
time/mode setting would fail on the broken symlink.

Symlinks don't have meaningful modified times or modes of their own, so
only set these values on non-symlinks.

Rename the file "a" in the test to expose the bug.

[FIXES JENKINS-13649] As FilePath(FilePath,String) expects multi-segment relative paths, we should ensure that the multiple segments are using the correct separator character for the remote OS

WorkspaceSnapshot now uses the tar.gz format to handle symlinks
correctly.

Tar/untar now correctly supports symlinks.

FilePath was a little lacking in documentation, this documents getRemote,
createTempFile, createTextTempFile and createTempDir.

[JENKINS-11073] don't fail copyToWithPermissions if setting last-modified fails on Windows (more reliable detection of Windows platforms than before)