[BUG] make_whole center kwarg not exposed

[lohedges]

The make_whole method on a cursor implies that that there is a center kwarg that can be used to optionally re-center the system when unwrapping molecules that are split across the periodic boundary. However, this only appears to be applied to the Cursor base class, not, e.g. CursorsM. In this case, it needs to be passed as a positional argument:

In [1]: import sire as sr

In [2]: mols = sr.load_test_files("ala.crd", "ala.top")

In [3]: center = mols[0].coordinates()

In [4]: mols.make_whole(center=center)
╭─────────────────────────────── Traceback (most recent call last) ────────────────────────────────╮
│ in <module>:1                                                                                    │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
TypeError: System.make_whole() got an unexpected keyword argument 'center'

In [5]: mols.make_whole(center)
╭─────────────────────────────── Traceback (most recent call last) ────────────────────────────────╮
│ in <module>:1                                                                                    │
│                                                                                                  │
│ /home/lester/.conda/envs/openbiosim/lib/python3.12/site-packages/sire/system/_system.py:159 in   │
│ make_whole                                                                                       │
│                                                                                                  │
│    156 │   │   else:                                                                             │
│    157 │   │   │   from ..base import create_map                                                 │
│    158 │   │   │                                                                                 │
│ ❱  159 │   │   │   self._system.make_whole(map=create_map(map))                                  │
│    160 │   │                                                                                     │
│    161 │   │   self._molecules = None                                                            │
│    162                                                                                           │
│                                                                                                  │
│ /home/lester/.conda/envs/openbiosim/lib/python3.12/site-packages/sire/base/__init__.py:201 in    │
│ create_map                                                                                       │
│                                                                                                  │
│   198 │   if map is None:                                                                        │
│   199 │   │   wrapped_values = {}                                                                │
│   200 │   │                                                                                      │
│ ❱ 201 │   │   for key, value in values.items():                                                  │
│   202 │   │   │   try:                                                                           │
│   203 │   │   │   │   wrapped_values[key] = _Base.PropertyName(value)                            │
│   204 │   │   │   except Exception:                                                              │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
AttributeError: 'Vector' object has no attribute 'items'

In [6]: cursor = mols.cursor()

In [7]: cursor = cursor.make_whole(center=center)
╭─────────────────────────────── Traceback (most recent call last) ────────────────────────────────╮
│ in <module>:1                                                                                    │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
TypeError: CursorsM.make_whole() got an unexpected keyword argument 'center'

In [8]: cursor = cursor.make_whole(center)

It would also be nice if the center kwarg was exposed when calling make_whole on the sire.system._system.System object.

[chryswoods]

This should be a quick fix - I'll work on this next for the 2024.2.0 release.