Use INSTALL_DATA rather than INSTALL for copying non executable files in
OS X application bundle.
Tested by running "all appbundle" make target and trying the resulting
application bundle, host system is OS X 10.9.2 .
* Use the latest version, with limited memory usage, and path to
on-disk db (try mouting qa/tmp on a tmpfs)\
* enable -debug=net
* re-enable BitcoindComparisonTool in pull-tester
Adds an 'appbundle' target that creates a top-level Bitcoin-Qt.app/
Modifies the 'deploy' target so that it leaves behind Bitcoin-Qt.app;
make clean will remove it.