Solr::configure_server now takes "version" as one of the keys in the
option array, and behaves slightly differently depending on whether
that version is 3 or 4, to provide support for both Solr versions.
The Solr extras and templates have also moved, so that different
versions can be provided for the two different Solr versions.
Solr_Configure takes the `indexstore.mode` configuration variable to set how
to upload new configuration to the Solr server. However the various modes
were within Solr_Configure and you couldnt add more without altering the module
This changes Solr_Configure to make the configuration upload portion
contained with a seperate class thats selected via `indexstore.mode`
to fix that.
- Made Solr_Configure task output more expressive by exposing the directories involved
- Documented configuration copying process, and how to override it
