Properly documenting null behavior of User-related methods.
When NodeMonitor is reconfigured or when the instance goes online, recompute the values.

Based on the following IRC conversations:

 (04:02:29 PM) cliffano: my build slave is offline, "Disk space is too low. Only 0.331GB left on" , but the box has 5.5Gb free.. i've tried disabling the disk space checking, restarted both master and slave, that error message is still there
 (04:03:03 PM) rtyler: I've seen that a couple times, I think I just disconnected and reconnected the slave
 (04:03:47 PM) cliffano: no dice for me.. reconnected several times.. even tried deleting more stuffs to free up more space, still exactly the same error message
 (04:04:04 PM) rtyler: you could try reinstalling windows
 (04:04:06 PM) ***rtyler ducks
 (04:04:22 PM) cliffano: lol yea
 (04:04:49 PM) kohsuke: cliffano: you can force the recomputation of those metrics
 (04:04:56 PM) kohsuke: otherwise it's only once an hour
 (04:05:17 PM) rtyler: wait, you can force it?
 (04:05:37 PM) kohsuke: http://ci.jenkins-ci.org/computer/ "refresh status"
 (04:06:26 PM) rtyler: ah
 (04:07:25 PM) cliffano: kohsuke: thanks, that worked..
 (04:07:43 PM) kohsuke: although I expect that if you've been reconnecting that should be sufficient
 (04:08:08 PM) kohsuke: And I probably should also do that automatically when you reconfigure the column, threashold, etc
 (04:10:39 PM) cliffano: kohsuke: reconnecting didn't help somehow... i tried disconnecting from the UI, tried killing the process on the slave machine, restarted etc
 (04:10:56 PM) kohsuke: it's probably caching the value
 (04:12:16 PM) cliffano: kohsuke: does it cache in the filesystem? i restarted both master and slaves
 (04:13:09 PM) kohsuke: it's stored in Computer
 (04:13:11 PM) kohsuke: so I guess that explains
 (04:13:34 PM) kohsuke: let me clear this when a slave connects
 (04:16:23 PM) cliffano: kohsuke: thanks :)
Typo.
Fixing link again, and moving to package Javadoc.
documenting API access to the progressive output.
[maven-release-plugin] prepare release jenkins-1.477
[maven-release-plugin] prepare for next development iteration
updated changelog for release
releasing a new plugin parent POM
toward the next release
updated changelog as a part of the release
merged back the RC branch
creating an RC branch
the trunk is toward 1.479-SNAPSHOT
Move script element into l:header in order to prevent Quirks mode
Fix description preview and syntax highlighting
Description preview should be enabled even if syntax highlighting is disabled

For instance, use PegDown Formatter and enable SUPPRESS_ALL_HTML.
JENKINS-12735 - Maven version range resolution.
[FIXED JENKINS-14769] NPE from UpdateSite$Plugin.getNeededDependencies.
This class is useless if these methods are protected

* The whole point of the rule is to allow access to the helper methods, so they need to be public

* also synced up with HudsonTestCase