[JENKINS-3265] [JENKINS-17341] Even if older plugins throw an NPE during reload, continue loading job.

removed the noAnime() conversions, so we can rely on the compiler to warn us, if we forget a case here

Add convenience method for checking if object is MatrixProject

[FIXED JENKINS-18671] Clock Difference broken on Manage Nodes page

against incorrect values if times are ever compared between different JVM nodes

System.nanos() returns a monotonically increasing value that is not related
to wallclock time. Use System.currentTimeMillis() instead.