debian: Fill in gecos field for jenkins user

Otherwise when Jenkins runs git, git will complain that the identity is
not set up correctly and will fail.
[JENKINS-3107] Expand an Advanced section if some fields are already customized.
Initial implementation handles only text fields, not e.g. checkboxes.
[JENKINS-3107] Rather than preëxpanding the Advanced area, just show an icon.
[JENKINS-3107] IE 9 fix.
[JENKINS-3107] Icon looks better before button rather than after, for reasons of alignment with the rest of the form.
creating an RC branch
the trunk is toward 1.530-SNAPSHOT
Improved name of Maven project.
[FIXED JENKINS-18846] Update symlinks for Maven module builds.
Need to restore the owner of the describable list so that changes in subsequent sessions will be persisted.
(Issue not reproduced here, but was in similar ArtifactManagerConfiguration: 757fe0844ce0d53d08c9d762ddce4b1190ab8cd4.)
@since
[FIXED JENKINS-9637] Fixed the 404 when clicking the testResult on the Project Page when there is only an aggregated test result for a freestyle job. The name of the link is still wrong.
[FIXED JENKINS-9637] Fixed the 404 when clicking the testResult on the Project Page when there is only an aggregated test result for a freestyle job. The name of the link is still wrong.
[FIXED JENKINS-19332]

- set findbugs version to 2.5.2 to avoid:
[WARNING] 'reporting.plugins.plugin.version' for
org.codehaus.mojo:findbugs-maven-plugin is missing. ...

- delete maven-pmd-plugin and maven-checkstyle-plugin (commented out
since more than two years)
Worth recording a UserInterruption even for the anonymous user.
If JenkinsLocationConfiguration.jenkinsUrl is still null, CoreEnvironmentContributor will silently skip several variables.
No obvious fix for that, but at least document it so it is not so surprising.
[FIXED JENKINS-16261] Defer JAR copying from MavenComputerListener.preOnline.
Close JarFile resources in PluginWrapper and UpdateCenter
Display an explanatory message when Jenkins CLI attempts to build an
unbuildable project.
Externalized "Cannot build..." messages to Messages.properties.