README fix, improvements.

README.md

@@ -100,7 +100,7 @@ You can run your own server or connect to mine. The server is written in Python
 but requires a compiled DLL so it can perform the terrain generation just like
 the client.
 
-    gcc -std=c99 -O3 -fPIC -shared -o world -I src -I deps/noise deps/noise/noise.c src/world.c
+    gcc -std=c99 -O3 -fPIC -shared -o world -I src -I deps/noise deps/noise/noise.c src/worldgen/*
     python server.py [HOST [PORT]]
 
 ### Controls

deps/noise/noise.c

@@ -1,4 +1,6 @@
 /*
+https://github.com/fogleman/Craft
+
 noise.h and noise.c are derived from this project:
 
 https://github.com/caseman/noise

deps/noise/noise.h

@@ -1,4 +1,7 @@
 /*
+These files are from Craft:
+https://github.com/fogleman/Craft
+
 noise.h and noise.c are derived from this project:
 
 https://github.com/caseman/noise

src/map.h

@@ -27,9 +27,9 @@ typedef union {
 } MapEntry;
 
 typedef struct {
-    int dx;
-    int dy;
-    int dz;
+    short dx;
+    short dy;
+    short dz;
     unsigned int mask;
     unsigned int size;
     MapEntry *data;