Making API doc links point at release version

[hflynn]

API doc links currently point at the CI builds in Jenkins. This PR makes them point at the release version as linked from the downloads page.

To test, the links are on the front/index page of the staging docs -https://www.openmicroscopy.org/site/support/omero5-staging/

Cc @jburel @sbesson

[sbesson]

Very nice.

[jburel]

OmeroJava points to ice33 page. This is about to be deprecated see gh-763.
Link should point to ice34 page.

[hflynn]

Where the links point is controlled by what is linked from the downloads page @jburel so needs to be changed on the ome-release repo not this PR.

[hflynn]

@jburel where did you find the link to ice33 docs? All 3 are coming up as 34 for me from the links on the staging index page.

[sbesson]

All subsequent Javadoc links are correctly redirected. See for instance http://www.openmicroscopy.org/site/support/omero5-staging/developers/Modules/Api.html and the console output of http://ci.openmicroscopy.org/view/Docs/job/OMERO-5.0-merge-docs/657/console.
Looks good to merge to me.

[hflynn]

Thanks Seb, merging and rebasing.

[hflynn]

--rebased-to #769

[hflynn]

N.B. we are going to need latest/omero5.1/ redirects if we release concurrently again anyway.