Bring back space.{un}pack_point but deprecate them

Why:

The plugin orion.skopt.algo is relying on these functions so we need to
keep them unlees we update the plugin.

How:

Call the new methods internally and log a warning that {un}pack_point
will be removed in v0.2.0.

src/orion/algo/space.py

@@ -33,11 +33,17 @@
 """
 
 from collections import OrderedDict
+import logging
 import numbers
 
 import numpy
 from scipy.stats import distributions
 
+from orion.core.utils.points import flatten_dims, regroup_dims
+
+
+logger = logging.getLogger(__name__)
+
 
 def check_random_state(seed):
  """Return numpy global rng or RandomState if seed is specified"""
@@ -818,3 +824,25 @@ def __repr__(self):
  """Represent as a string the space and the dimensions it contains."""
  dims = list(self.values())
  return "Space([{}])".format(',\n '.join(map(str, dims)))
+
+
+def pack_point(point, space):
+ """Take a list of points and pack it appropriately as a point from `space`.
+
+ This function is deprecated and will be removed in v0.2.0. Use
+ `orion.core.utils.points.regroup_dims` instead.
+ """
+ logger.warning('`pack_point` is deprecated and will be removed in v0.2.0. Use '
+ '`orion.core.utils.points.regroup_dims` instead.')
+ return regroup_dims(point, space)
+
+
+def unpack_point(point, space):
+ """Flatten `point` in `space` and convert it to a 1D `numpy.ndarray`.
+
+ This function is deprecated and will be removed in v0.2.0. Use
+ `orion.core.utils.points.flatten_dims` instead.
+ """
+ logger.warning('`unpack_point` is deprecated and will be removed in v0.2.0. Use '
+ '`orion.core.utils.points.regroup_dims` instead.')
+ return flatten_dims(point, space)