Lower MaxGatherers for small trees with <=100 wood

- Reduced the MaxGatherers value for the smallest trees with 100 or
  less wood from the default (8) to 6 or 4.

- The affected trees are Bush (4), Atlas Cedar Sapling (4), Cretan Date
  Palm (Short) (6), and Fir Sapling (4).

- Small trees with 100 or less wood that already had a MaxGatherers
  value lower than the default (8), such as Bamboo (Single) (1) and
  Baobab Sapling (2), were left unchanged.

binaries/data/mods/public/simulation/templates/gaia/tree/cedar_atlas_1_sapling.xml

@@ -5,6 +5,7 @@
   </Identity>
   <ResourceSupply>
     <Max>50</Max>
+    <MaxGatherers>4</MaxGatherers>
   </ResourceSupply>
   <VisualActor>
     <Actor>flora/trees/cedar_atlas_sapling.xml</Actor>

binaries/data/mods/public/simulation/templates/gaia/tree/cretan_date_palm_short.xml

@@ -5,6 +5,7 @@
   </Identity>
   <ResourceSupply>
     <Max>100</Max>
+    <MaxGatherers>6</MaxGatherers>
   </ResourceSupply>
   <VisualActor>
     <Actor>flora/trees/palm_cretan_date_short.xml</Actor>

binaries/data/mods/public/simulation/templates/gaia/tree/fir_sapling.xml

@@ -5,6 +5,7 @@
   </Identity>
   <ResourceSupply>
     <Max>50</Max>
+    <MaxGatherers>4</MaxGatherers>
   </ResourceSupply>
   <VisualActor>
     <Actor>flora/trees/fir_sapling.xml</Actor>

binaries/data/mods/public/simulation/templates/mixins/bush.xml

@@ -12,6 +12,7 @@
   </Obstruction>
   <ResourceSupply>
     <Max>100</Max>
+    <MaxGatherers>4</MaxGatherers>
   </ResourceSupply>
   <StatusBars>
     <HeightOffset>8</HeightOffset>