[DEM] Assigning conditions to DEM. Possibility to assign them in Mesh Mode

[farrufat-cimne]

Should the user be able to define conditions applied on DEM particles directly over the mesh?
Currently, the code is limited to applying it on geometry mode, as stated in:

proc DEM::write::GetSpheresGroupsListInConditions { } {
    set conds_groups_dict [dict create ]
    set groups [list ]

    # Get all the groups with spheres
    foreach group [GetSpheresGroups] {
        foreach surface [GiD_EntitiesGroups get $group elements] {
            foreach involved_group [GiD_EntitiesGroups entity_groups elements $surface] {
                set involved_group_id [write::GetWriteGroupName $involved_group]
                if {$involved_group_id ni $groups} {lappend groups $involved_group_id}
            }
        }
    }

    # Find the relations condition -> group
    set xp1 "[spdAux::getRoute [GetAttribute conditions_un]]/condition"
    foreach cond [[customlib::GetBaseRoot] selectNodes $xp1] {
        set condid [$cond @n]
        foreach cond_group [$cond selectNodes "group"] {
            set group [write::GetWriteGroupName [$cond_group @n]]
            if {$group in $groups} {dict lappend conds_groups_dict $condid [$cond_group @n]}
        }
    }
    return $conds_groups_dict
}

Once this question is settled, if we decide to allow applying conditions over mesh, notice that in mesh mode one can apply conditions over 4 items: nodes, l elements, s elements and v elements.

[farrufat-cimne]

@maceligueta , @jginternational

[farrufat-cimne]

@jginternational ,
swapping :

    foreach group [GetSpheresGroups] {
        foreach surface [GiD_EntitiesGroups get $group elements] {
            foreach involved_group [GiD_EntitiesGroups entity_groups elements $surface] {
                set involved_group_id [write::GetWriteGroupName $involved_group]
                if {$involved_group_id ni $groups} {lappend groups $involved_group_id}
            }
        }
    }

for:

# Get all the groups with spheres
    foreach group [GetSpheresGroups] {
        foreach surface [GiD_EntitiesGroups get $group nodes] {
            foreach involved_group [GiD_EntitiesGroups entity_groups nodes $surface] {
                set involved_group_id [write::GetWriteGroupName $involved_group]
                if {$involved_group_id ni $groups} {lappend groups $involved_group_id}
            }
        }
    }

with nodes instead of elements solve the problem.
we get the nodes instead, works both geometry mode and mesh mode.
Is it ok? It doesnt seem to cause any issue

[farrufat-cimne]

@jginternational