citation-style-language / styles

Replacing the prefix/suffix adjacent spaces with group and one delimiter space, as described generally in #1301 . Search for this pattern here (70 hits in 70 files):

```
<[^/>]*"edition"[^/>]*suffix="[^"/>]* "[^/>]*/?>\s*\r\n\s*<[^/>]*"edition"[^/>]*prefix=" [^"/>]*"[^/>]*/?>
```

Every occurence here looks actually the same:

```
          <group>
            <text variable="edition" suffix=" "/>
            <text term="edition" prefix=" "/>
          </group>
```
which will then replaced by
```
          <group delimiter=" ">
            <text variable="edition"/>
            <text term="edition"/>
          </group>
```