Remove version number from readme.html in branches

[johnbillion]

Branches prior to 4.7 contain the patch version number in the readme.html file. The 4.7 branch contains the minor version. The 4.8 branch removed the version number entirely (#35554).

In all branches, the version number should be removed entirely to make backporting slightly less painful.

In addition, the readme.html version number assertion in Tests_Basic::test_readme() test should be removed from branches where it still exists.

[johnbillion]

In 42093:

General: Remove the version number from the readme file in the 4.3 branch.

See #42386

[johnbillion]

In 42094:

General: Remove the version number from the readme file in the 4.2 branch.

See #42386

[johnbillion]

In 42095:

General: Remove the version number from the readme file in the 4.1 branch.

See #42386

[johnbillion]

In 42096:

General: Remove the version number from the readme file in the 4.0 branch.

See #42386

[johnbillion]

In 42097:

General: Remove the version number from the readme file in the 4.

See #42386

[johnbillion]

In 42098:

General: Remove the version number from the readme file in the 3.8 branch.

See #42386

[johnbillion]

In 42099:

General: Remove the version number from the readme file in the 3.7 branch.

See #42386

[johnbillion]

In 42100:

General: Remove the version number from the readme file in the 4.7 branch.

See #42386

[johnbillion]

In 42101:

General: Remove the version number from the readme file in the 4.6 branch.

See #42386

[johnbillion]

In 42102:

General: Remove the version number from the readme file in the 4.5 branch.

See #42386

[johnbillion]

In 42103:

General: Remove the version number from the readme file in the 4.4 branch.

See #42386