[MRELEASE-1092] Synch with changes plugin

**[Ernst Reissner](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=ernstreissner)** opened **[MRELEASE-1092](https://issues.apache.org/jira/browse/MRELEASE-1092?redirect=false)** and commented

the changes plugin is based on the file changes.xml.
It is a sequence of releases each covering the changes made in the current release.
The form is

```[xml]

...

```

I suggest, that the release plugin shall check whether
- the version is the version to be
- the date is the current date
- the description is not empty.

If all this is true, on can assume that the release element is maintained.
One should advise to start with empty version and empty date and empty description.

---

**Affects:** 3.0.0-M5

Start by tracing the Maven release plugin behavior that reads changes.xml and compare it with the requested release element checks. Done means the plugin verifies the version, current date, and non-empty description, and advises starting with empty values when the release element is not maintained.

Written by the indexing model from the issue text.