- `plugins/slurm/scord_prolog.sh`: Prolog script. Starts `scord-ctl`
   server and sets up environment.
- `plugins/slurm/scord_epilog.sh`: Epilog script. Stops `scord-ctl`
   server and cleans up environment.
- `plugins/slurm/scord_common.sh`: Common code to prolog and epilog.

Merge branch 'amiranda/119-add-a-user-level-library-for-functionalities-not-requiring-direct-scord-intervention' into 'main'

Resolve "Add a user level library for functionalities not requiring direct `scord` intervention"

This MR adds the library `libscord-user.so` with user-level interfaces to request
data transfers from `scord` from application code.

Closes #119

See merge request !103

Resolve "Tests require `scord.conf` to exist in `/etc`"

Closes #145

See merge request !102

Resolve "Update Spack"

This MR fixes an issue with conflicting CMake versions between `agio` and `scord` recipes.

It also adds a new `address` variant to enable configuring the binding address during installation with Spack.

Closes #144

See merge request !101

Add support for running tests while installing.

Resolve "Install `ping` client as utility binary"

Closes #138

See merge request !97

Fixes #138

Merge branch 'amiranda/142-rpc-servers-should-print-their-connection-address-as-returned-by-thallium' into 'main'

Resolve "RPC servers should print their connection address as returned by thallium"

Closes #142

See merge request !100

Resolve "Allow `scord-ctl` to write a pidfile"

Closes #141

See merge request !99

Resolve "Missing public interfaces for `ADM_node_t`"

Closes #140

See merge request !98

- Add `ADM_node_get_hostname()`
- Add `ADM_node_get_type()`

Resolve "`scord-ctl` binary is not installed"

Closes #139

See merge request !96

Fixes #139

Resolve "Use configured scripts for adhoc deployment/teardown"

This MR updates the deployment and termination RPCs so that they are
executed by `scord-ctl`. The mechanism takes advantage of the 
configuration information added in !93 to generate generic commands
for each configured adhoc storage instance.

This MR also updates `ADM_register_adhoc_storage`, making it generate
and record an internal `adhoc_uuid` that can be forwarded to `scord-ctl`
to refer to running adhoc storage instances.

This MR also renames the RPC `ADM_tear_down_adhoc_storage` to
`ADM_terminate_adhoc_storage`.

Closes #133

See merge request !94