This patch makes the template plugin used for rendering the Koha version
use the introduced method.
I did this checks:
```shell
cd koha-tmpl
git grep Koha.Version
```
The places Koha.Version is used, it is used as:
* `Koha.Version.maintenance`
* `Koha.Version.release`
* Assigned to a variable like this `SET koha_version = Koha.Version`
All occurences of the `koha_version` template variable are:
* `koha_version.development`
* `koha_version.major`
* `koha_version.minor`
This implies the newly added `.version` attribute has no undesired side
effects in templates.
Note: plugins-home.tt has a different use of a variable named the same,
which is unrelated.
To test:
1. Apply this patch
2. Run:
$ ktd --shell
k$ prove t/Koha_Template_Plugin_Koha.t
=> SUCCESS: Tests pass!
3. Sign off :-D
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@openfifth.co.uk>
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