sdist and install now work

next step is using a custom data dir, and falling back on the package
data dir. Also, fixing --version.

overviewer_core/src/endian.c

@@ -0,0 +1,39 @@
+/* 
+ * This file is part of the Minecraft Overviewer.
+ *
+ * Minecraft Overviewer is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * Minecraft Overviewer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
+ * Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with the Overviewer.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* simple routines for dealing with endian conversion */
+
+#define UNKNOWN_ENDIAN 0
+#define BIG_ENDIAN 1
+#define LITTLE_ENDIAN 2
+
+static int endianness = UNKNOWN_ENDIAN;
+
+void init_endian(void) {
+    /* figure out what our endianness is! */
+    short word = 0x0001;
+    char* byte = (char*)(&word);
+    endianness = byte[0] ? LITTLE_ENDIAN : BIG_ENDIAN;
+}
+
+unsigned short big_endian_ushort(unsigned short in) {
+    return (endianness == LITTLE_ENDIAN) ? ((in >> 8) | (in << 8)) : in;
+}
+
+unsigned int big_endian_uint(unsigned int in) {
+    return (endianness == LITTLE_ENDIAN) ? (((in & 0x000000FF) << 24) + ((in & 0x0000FF00) << 8) + ((in & 0x00FF0000) >> 8) + ((in & 0xFF000000) >> 24)) : in;
+}