Migrated some usages of GNUCLibrary to the jnr PosixAPI, fixed 'mvn -Plight-test install' on ubuntu with OpenJDK.

[JENKINS-16332] Further diagnostics. Note that you must enable a hudson.model.User logger at FINE or below to use.

- Adds an option to the Global Security screen to hide the remember me checkbox
- A crafty user could use their browser to re-insert the form field and thereby get Jenkins to set the
  remember_me cookie on their browser, but this option should cover the 99.9% case.

This reverts commit 647695e2.

This reverts commit 647695e2.

[FIXED JENKINS-19613] 49c731fc made PROXY_HEADER static under the assumption that XStream would treat that like a missing field.
Unfortunately it threw an error instead, breaking startup; fixed by renaming the constant.

Add a "view" link to a job's Last Successful Artifacts list, just like
an individual build's Build Artifacts list has.

[FIXED JENKINS-19749] Add a -f option for following the build without passing interrupts through to the build

[FIXED JENKINS-19739] When installing a plugin and the needed dependencies have compatibility issues, warn the user

[FIXED JENKINS-19736] Installing a plugin with optional dependencies doesn't upgrade the optional dependencies when needed

- This is an initial version of the feature.
- The information about slave names is still exposed via label autocomplete

Suppressed a confusing 2nd error message.

inside buildEnvironmentFor Job since it doesn't make sense
outside of a running build.

master's

Running hypothesis: something historically saved a user configuration file with a bogus fullName;
thereafter anyone calling User.get(correctFullName) will get a User with the old fullName.
This would make the bug unreproducible in fresh Jenkins installations.

Use an href for external URL in @see clause