[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.
[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)
[FIXED JENKINS-19168] Stapler 1.218.
Merge remote-tracking branch 'origin/master' into advanced-auto-expand-JENKINS-3107
customizedFields support for f:checkbox (and thus also f:optionalBlock).
@DataBoundConstructor does not belong on constructos of abstract classes.
Merge branch 'master' of github.com:jenkinsci/jenkins
Don't underline the space between RSS icons and the link text.
Fix for underlined trailing spaces on project links. Tried various solutions including the Jelly trim attribute, but in the end the only thing that would work was to remove the line break prior to the closing tag.
Merge branch 'master' of github.com:jenkinsci/jenkins
creating an RC branch
the trunk is toward 1.531-SNAPSHOT
[JENKINS-18775] Noting that this usage of XStream is unsupported and could cause future problems.
[FIXED JENKINS-19377] ViewJob.removeRun must take effect synchronously or LogRotator gets confused.
7232798611b66f4a03ad8670c07cb58220f4d866 mistakenly made a new method deprecated.
Fixed incosistency, use st:nbsp for all spaces.
Merge branch 'advanced-auto-expand-JENKINS-3107'