[FIXED JENKINS-26155] Fix Hungarian build index page while building

Was using JS to size panels. This change only effects screens > 768px. Less than 768px is responsive.

Also fixes JENKINS-25498

Node monitor refactorization

change BuildStability message into more appropriate one

[FIXED JENKINS-25788] RunMap.remove was always returning false, even when the Run was in fact removed.

Conflicts:
	changelog.html

Tested on a windows box to automaticaly install 1.4, 1.5, 1.6, 1.7 and 1.8 JDKs

[FIXED JENKINS-23797] Produce human readable output in DiskSpaceMonitorDescriptor.DiskSpace.toString()