Added the new stone path terrain by musketaquid.

Named "Stone path" and using the code Rp. Feel free to change the name
and code. Also, I'm not sure how the probability %'s should be like
exactly, but this seems to work well enough.

data/core/terrain-graphics/_final.cfg

@@ -457,6 +457,13 @@
 {TERRAIN_BASE_PROB  Rr                  flat/road2                    50}
 {TERRAIN_BASE       Rr                  flat/road}
 
+{TERRAIN_BASE_PROB  Rp                  flat/stone-path6                    17}
+{TERRAIN_BASE_PROB  Rp                  flat/stone-path5                    19}
+{TERRAIN_BASE_PROB  Rp                  flat/stone-path4                    25}
+{TERRAIN_BASE_PROB  Rp                  flat/stone-path3                    33}
+{TERRAIN_BASE_PROB  Rp                  flat/stone-path2                    50}
+{TERRAIN_BASE       Rp                  flat/stone-path}
+
 {TERRAIN_BASE       Rd                  desert-road}
 
 {TERRAIN_BASE       *^Dc                desert_crater}
@@ -868,6 +875,7 @@
 
 {TERRAIN_ADJACENT          -280    Gs               (!,Gs,Qxu)                           flat/savanna}
 {TERRAIN_ADJACENT          -290    Rr               (!,Rr)                               flat/road}
+{TERRAIN_ADJACENT          -300    Rp               (!,Rp)                               flat/stone-path}
 {TERRAIN_ADJACENT_CUSTOM   -250    *^Gvs            (!,*^Gvs,C*,K*,*^F*,M*,H*,W*,S*)     flat/farm-veg-spring transition2}
 {TERRAIN_ADJACENT          -259    Re               (!,Re)                               flat/dirt}
 {TERRAIN_ADJACENT          -310    Rd               (!,Rd)                               desert-road}

data/core/terrain.cfg

@@ -566,6 +566,16 @@
     editor_group=flat
 [/terrain]
 
+[terrain]
+    symbol_image=flat/stone-path
+    id=stone_path
+    name= _ "Stone path"
+    string=Rp
+    aliasof=Gg
+    editor_group=flat
+[/terrain]
+
+
 [terrain]
     symbol_image=flat/farm-veg-spring-icon
     id=farm