StandardSideFilter
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		From FilterWML, this is the standard way of filtering on sides. The following attributes and sub-tags are permitted:
- side: filter matches only if side number is contained in a comma-separated list. 'all' matches all sides.
 - [has_unit]: filter matches only if side controls a unit matched by this StandardUnitFilter
 
Also, [and], [or], and [not] subfilters are supported.
Interaction of SSF and side= in tags like [disallow_recruit] :
selects side 4 only :
[disallow_recruit]
  side=1,4
  [filter_side]
    side=4,5  
  [/filter_side]
[/disallow_recruit]
selects sides 1 and 4
[disallow_recruit] side=1,4 [/disallow_recruit]
selects sides 4 and 5
[disallow_recruit]
  [filter_side]
    side=4,5  
  [/filter_side]
[/disallow_recruit]