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Raise IllegalOperationError instead of NotAllowedError when
consequent map checks are requested before the map check interval
passes.

Check whether an object is available in the storage backend before copying it.
Otherwise, fail with 403 (FORBIDDEN) response status.

* Do not generate/register a mapfile for zero size objects since
there are not stored in the storage backend.
* Several minor fixes

Set default value to 1sec instead of 5sec. After taking
a snapshot the user may try immediately to create a new
machine based on the last snapshot. If the mapfile check
interval value is high enough then the end user has to wait
at least the defined interval.

Pass Archipelago config file, XSEG pool size and
mapfile check interval configuration values when
instantiating Pithos backend class.

Suppress 'is_snapshot' return value from modular backend
get_object_hashmap function.

Propagate 'is_snapshot' property to modular backend functions.

Add metadata to ObjectWrapper initialization variables and
propagate 'is_snapshot' property to backend functions.

Introduce new property 'is_snapshot' and 'is_available' and
remove old 'archip' prefix for Archipelago volumes.
Refactor relevant functions.

This commit restores the sqlite backend which was broken
by the previous commits.

Newly created objects via copy will be associated with a new mapfile.
Hence, the copy operation should store this mapfile to the storage
backend.

The backend should not store zero size objects.
This commit contains the necessary modifications for the modular backend.

Object mapfiles on the storage backend will no more be identified by the
object's hashmap (content depended).
Each object upon creation will be assigned with a unique tag by which they
will be referenced on the storage backend.
This commit contains the necessary modifications in the pithos database.

Until now Pithos was using unhexlified mapfiles but now
Archipelago transparently converts those mapfiles
to hexlified.
Mapper functions do not need to convert unhexlified mapfiles
to hexlified ones.

Add the missing cyclades_volume definition in the service registration
script.

Fix `check_conflicting_projects` function in order to return a (result,
message) tuple in silent mode, which is expected by
`validate_project_action` function.

do not display projects the user is not member to and no resources
are consumed from the available project quotas.

to ensure user object modifications that took place during the
login request, such as updated token expiration date, won't
get overridden.

fix project application form submit tests

Closes #131