Made all paths dependent on DATA_DIR, USER_DIR, BIN_DIR or LIB_DIR. Data access can now be separated from saved games and binaries.

Fixed a file handle leak.
Bumped revision to 0.74b (linux).
Reworked the build system to remove uneeded dependencies (linux).
Removed use of PATHSEPARATOR since Windows can use / too.

client/NetPacksClient.cpp

@@ -541,7 +541,7 @@ void YourTurn::applyCl( CClient *cl )
 
 void SaveGame::applyCl(CClient *cl)
 {
-	CSaveFile save("Games" PATHSEPARATOR + fname + ".vcgm1");
+	CSaveFile save("Games/" + fname + ".vcgm1");
 	save << *cl;
 }
 
@@ -639,4 +639,4 @@ void TradeComponents::applyCl(CClient *cl)
 		default: 
 			tlog2 << "Shop type not supported! \n";
 	}
-}
+}