Tidy up GNUstep cache folder selection

Select a sensible location for downloaded OXZs but don't do anything with it yet.

src/Core/OOCacheManager.m

@@ -324,6 +324,12 @@ static OOCacheManager *sSingleton = nil;
 			~/GNUstep/Library/Caches/
 	*/
 
+	/* Okay, I fixed the hard-coding of GNUStep - NSSearchPath seems
+	 * to work just fine. Is there any good reason that we don't
+	 * create an org.aegidian.oolite subfolder on GNUStep like Mac
+	 * has? If we did, then we could just use the Mac function on all
+	 * platforms... - CIM: 2014-01-05 */
+
 	NSArray *cachePaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES);
 	NSString *cachePath = [cachePaths objectAtIndex:0];
 	if (cachePath == nil)

src/Core/OOOXZManager.m

@@ -109,6 +109,21 @@ static OOOXZManager *sSingleton = nil;
 }
 
 
+/* The install path for OXZs downloaded by
+ * Oolite. Library/ApplicationSupport seems to be the most appropriate
+ * location. */
+- (NSString *) installPath
+{
+	NSArray *paths = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory,NSUserDomainMask,YES);
+	NSString *appPath = [paths objectAtIndex:0];
+	if (appPath != nil)
+	{
+		appPath = [appPath stringByAppendingPathComponent:@"org.aegidian.oolite"];
+	}
+	return nil;
+}
+
+
 - (NSString *) manifestPath
 {
 	return [[[OOCacheManager sharedCache] cacheDirectoryPathCreatingIfNecessary:YES] stringByAppendingPathComponent:kOOOXZManifestCache];