Filtered flat import of Oliver's svn package management branch

Bring the changes that aren't package management related and the ones
that are but don't take effect as long as they are ignored by the build
system into the master.

Summary of changes:
* Introduce private header <directories.h> with constants for a good
  deal of paths that should usually be retrieved via find_directory().
* Replace hard-coded paths by using find_directory() or the
  <directories.h> constants (e.g. in drivers and the kernel).
* Add find_directory() constants needed for package management.
* Add __HAIKU_ABI_NAME and B_HAIKU_ABI_NAME macros.
* src/apps/deskbar: BeMenu.* -> DeskbarMenu.*,
  DeskBarUtils.* -> DeskbarUtils.*
* Change deskbar menu settings directory from ~/config/be to
  ~/config/settings/deskbar.
* Other smaller cleanups, changes, and fixes.

src/apps/remotedesktop/RemoteDesktop.cpp

@@ -7,6 +7,8 @@
  */
 
 #include <Application.h>
+#include <FindDirectory.h>
+#include <Path.h>
 #include <Screen.h>
 #include <Window.h>
 
@@ -40,7 +42,6 @@ main(int argc, char *argv[])
 	bool listenOnly = false;
 	uint32 listenPort = 10900;
 	uint32 sshPort = 22;
-	const char *command = "/system/apps/Terminal";
 
 	for (int32 i = 2; i < argc; i++) {
 		if (strcmp(argv[i], "-p") == 0) {
@@ -85,10 +86,21 @@ main(int argc, char *argv[])
 
 	pid_t sshPID = -1;
 	if (!listenOnly) {
+
+		BPath terminalPath;
+		if (find_directory(B_SYSTEM_APPS_DIRECTORY, &terminalPath) != B_OK) {
+			printf("failed to determine system-apps directory\n");
+			return 3;
+		}
+		if (terminalPath.Append("Terminal") != B_OK) {
+			printf("failed to append to system-apps path\n");
+			return 3;
+		}
+
 		char shellCommand[4096];
 		snprintf(shellCommand, sizeof(shellCommand),
 			"echo connected; export TARGET_SCREEN=localhost:%lu; %s\n",
-			listenPort, command);
+			listenPort, terminalPath.Path());
 
 		int pipes[4];
 		if (pipe(&pipes[0]) != 0 || pipe(&pipes[2]) != 0) {