Xcode project update: Change base SDK and deployement target to 10.6.

Change default compiler to Clang v1.0 for up to 40% compile and runtime
speed increase.

Improve control over install location through user scripts and config
files.

scripts/install.sh

@@ -0,0 +1,45 @@
+#!/bin/sh
+
+# untitled.sh
+# GitX
+#
+# Created by Andre Berg on 19.10.09.
+# Copyright 2009 Berg Media. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Installs GitX.app to $CUSTOM_INSTALL_DIR from Install.xcconfig
+
+# returns 1 if $1 contains $2
+# and 0 if it does not
+function strcont() {
+    result="${1//*$2*/#}"
+    result="${result//#/$2}"
+    if [[ "$result" == "$2" ]]; then
+        echo 1
+    else
+        echo 0
+    fi
+}
+
+if [[ $(strcont $BUILD_STYLE "Install") == 1 ]]; then
+    echo "Installing to ${CUSTOM_INSTALL_DIR}... (switch to build config other than Install to avoid)"
+    if [[ -e /opt/local/bin/rsync ]]; then
+        /opt/local/bin/rsync -rlHEptog --xattrs --acls "$BUILT_PRODUCTS_DIR/$FULL_PRODUCT_NAME" "$CUSTOM_INSTALL_DIR/$FULL_PRODUCT_NAME"
+    else
+        rsync -rlHEptog "$BUILT_PRODUCTS_DIR/$FULL_PRODUCT_NAME" "$CUSTOM_INSTALL_DIR/$FULL_PRODUCT_NAME"
+    fi
+    
+else
+    echo '$BUILD_STYLE does not contain "Install"... nothing to copy'
+fi