* Use fileToPath()

This is a follow-up to PR 3210 on GitHub. See:
https://github.com/jenkinsci/jenkins/pull/3210#discussion_r160045107

* Switch two File.toPath() calls to Util.fileToPath()

* Delete an unused import

These changes were suggested by Extra Hints for NetBeans IDE:
http://plugins.netbeans.org/plugin/73447/

- Plugins should really be expecting it, but as historically they have not, may as well convert to IOE for them

* Clean up usages of IOUtils.closeQuietly and related calls predating Java 7.

* Review comments from @oleg-nenashev.

* Noticed another place where try-with-resources would protect against a potential leak.

- coding style was not matching the rest of Jenkins
- IOUtils.closeQuietly is a lot more concise way of achieving the same
  thing.
- AtomicFileWriter.abort() does close, so no need to close it one more
  time.

The stream was not properly closed.
In addition, when the abort would fail, the exception caused by the abort
would be propagated up the stack instead of the original exception.
This patch makes sure to close the stream and let the original exception
propagate.

Revisiting the fix. Avoid parsing the entire text by only looking at the tail portion.

add some copyright headers, some tab->ws


git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@21654 71c3de6d-444a-0410-be80-ed276b4c234a

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@15081 71c3de6d-444a-0410-be80-ed276b4c234a

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@11297 71c3de6d-444a-0410-be80-ed276b4c234a

first time around, check the timestamp from the disk. This would save pointless checks during development.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@10074 71c3de6d-444a-0410-be80-ed276b4c234a

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@9882 71c3de6d-444a-0410-be80-ed276b4c234a

getRootDir() isn't avaiable when it's called from the constructor (see #740), so instead make sure XmlFile creates directories.


git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@4330 71c3de6d-444a-0410-be80-ed276b4c234a

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@969 71c3de6d-444a-0410-be80-ed276b4c234a