[FIXED JENKINS-15126] Remove ";" from closing tag

After all, that's the installation the user is most likely going to choose, and if there's only one installation.

Plus when there's only one installation, there's no drop-down to select the Maven installation in the config UI, so the user is asked to do a rather unnatural "open config page" > "just click save" workflow.

java.lang.NullPointerException
	at hudson.tasks.CommandInterpreter.createScriptFile(CommandInterpreter.java:104)
	at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:66)
	at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:58)
	at com.cloudbees.hudson.plugins.modeling.impl.builder.BuilderImpl.perform(BuilderImpl.java:58)
	at hudson.plugins.m2extrasteps.M2ExtraStepsWrapper.executeBuildSteps(M2ExtraStepsWrapper.java:166)
	at hudson.plugins.m2extrasteps.M2ExtraStepsWrapper.access$200(M2ExtraStepsWrapper.java:43)
	at hudson.plugins.m2extrasteps.M2ExtraStepsWrapper$1.tearDown(M2ExtraStepsWrapper.java:137)
	at hudson.maven.MavenModuleSetBuild$RunnerImpl.doRun(MavenModuleSetBuild.java:817)
	at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:490)
	at hudson.model.Run.run(Run.java:1442)
	at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:477)
	at hudson.model.ResourceController.execute(ResourceController.java:88)
	at hudson.model.Executor.run(Executor.java:239)

 Allow gc to remove test results from memory in more proper way

Fix escaping on builds' REST API page

It breaks some already fixed issues like JENKINS-1557

Allow gc to remove test results from memory as these can consume a lot o...

The "Accessing Progressive Console Output" section of builds' REST API
page is displayed incorrectly.  It should contain "<pre>", but the
"&lt;" is replaced by a less-than sign.  This causes a <pre> tag to be
applied to the rest of the section.  Change the & to &amp; to prevent
this.

Solves the issue for newly created builds by not attempting to persist the original file upload record, which is useless after the build has run (the fileParameters dir in the build already archives them).
Does not help loading pre-fix builds in which the upload temp file has been deleted; for these, you must manually delete <file class="org.apache.commons.fileupload.disk.DiskFileItem" serialization="custom">…</file> from the build.xml.
(Did not find a straightforward way to just instruct XStream to ignore this bit of XML: it is easy to avoid serializing a field, but deserializing is different.)

[JENKINS-1295] Disable trigger downstream for maven jobs
Thanks !

Added reason for why we are rebuilding to the log message
Thanks !

Feature cli list jobs

[FIXED JENKINS-15940] WARNING: Caught exception evaluating: descriptor.getHelpFile(attrs.field). Reason: java.lang.NullPointerException

Require UPLOAD_PLUGINS permission for install-plugin cli command
Thanks !

minor textual improvements on Manage Jenkins page to improve appearance
Thanks

Added a trailing period to english AboutJenkins.Description because it
was the only message on that page having none.

this changes the rendering from
  ...functionality of Jenkins.(updates available)
to 
  ...functionality of Jenkins. (updates available)
which looks nicer.

Had to use  , regular whitespace wouldn't do.

German translations for AboutJenkins and OldDataMonitor links
Thanks