This is so that it fits better with the ports version rules.
What we have now is:
```
head
11.sYYYYMMDD +
|
|
|
11.0.aX |
| stable/11
+----------------+
12.sYYYYMMDD | 11.0.bX |
| |
| |
| |
| | releng/11.0
| +---------+
| 11.0.pYYYYMMDD | 11.0.rX |
| | |
| | 11.0 |
| 11.0sYYYYMMDD | |
| | 11.0_X |
| | |
| | |
| | v
| |
| 11.1.bX |
| |
| | releng/11.1
| +---------+
| 11.1.pYYYYMMDD | 11.1.rX |
| | |
| | 11.1 |
| 11.1sYYYYMMDD | |
| | 11.1_X |
| | |
| | |
| | v
| v
v
```
On the head branch, we have:
* 11.sYYYYMMDD < 11.0.aX
* 11.0.ax < 12.sYYYYMMDD
On the stable branch, we have:
* 11.0.aX < 11.0.bX
* 11.0.bX < 11.0.pYYYYMMDD
* 11.0.pYYYYMMDD < 11.0sYYYYMMDD
* 11.0sYYYYMMDD < 11.1.bX
...
On the releng branch, we have:
* 11.0.bX < 11.0.rX
* 11.0.rX < 11.0
* 11.0 < 11.0_X
We also have 11.0(_X) < 11.0sYYYYMMDD so the release branch is before
the stable branch.