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Add library synnefo.util.units for parsing numerical values
with an optional unit suffix and printing integer values based
on a given style.

Styles `b', `kb', `mb', etc allow printing in the respective multiples
of byte, style `auto' in a human-readable manner, while `none' omits
units altogether.

Add option `--unit-style' in all astakos management commands that print
resource limits and quota usage. Consult the resource definitions to find
out which unit, if any, to show. For resources with unit `bytes', all
commands default to MB.

Lock project's chain for every operation affecting either a project or
an application. Subsequently, lock user when needing to sync or to issue
commission to update pending_app quota.

In views, replace locking qh_add_pending_app with check_pending_app_quota,
which will only query quota, so that to respect the above mentioned order.

Order by id when locking multiple users.

 - Split code that lists and syncs quotas
 - Merge the latter with qh_sync_users
 - Move qh_sync_projects in quotas.py; sync only active members
 - Add missing select for update in project suspend
 - Clean up quotas.py

Also replace `quotas' with `quota' in strings and command line options.

To change base quota for a specified user:
  snf-manage user-modify user --set-base-quota resource limit

To import base quota in batch from a file:
  snf-manage astakos-quota --import-base-quota filename

Rename `initial' to `base quota' in command output.
Move code that creates/removes AstakosUserQuota entries in file quotas.py;
sync user to quotaholder after such a change.

Refs #3411

Refs #3530

Use the same utility function as astakos-quota. Update the latter
to a SynnefoCommand.

The following indicators are returned for each holding:
"limit": the quota limit (as before)
"usage": the current usage (pessimistically, includes any pending
         allocations)
"pending": the difference of max and min allocation, indicates
           that there are pending commissions on this holding

Intention is to collect all quota-related code to a single file.

Adjust astakos code to the new nested dict structure of quotas.

Simplifications due to removal of quantity and merging capacity into holding.
Also make sure that holders and resources are represented as strings in
quotaholder calls.

Import directly quotaholder.callpoint in endpoint/qh.py
instead of an HTTP client.
Remove code related to entities, such as registering users and services.
Remove sync_projects logic.

Inform specifically which users, if any, have been synced, instead of
listing the whole diff. The latter can be recovered by giving the
option --verify.

Print a message about astakos-quota calculating all user quotas,
which on a big system takes some time.

Refs #3389

Factor out trigger_sync() as lock_sync() to be used for other
sync processes in addition to sync_projects().
Implement sync_users(), which registers users and their quotas.
Use both sync processes in astakos-qh-sync management command.

Astakos-qh-sync will create quotas for all eligible users.
Users that have unverified emails are not considered eligible.
When users are activated by an admin via user-update --set-active,
their email is also marked as verified, therefore they become eligible.

* integration with quota holder
* new credit event for integration with aquarium

* new model Service
* new management commands for handling the services
* remove ASTAKOS_CLOUD_SERVICES setting
* change get_services API call to return
the Service objects
* separate admin from service API calls
* introduce send_feedback service API call

Refs: #2413