2014-01-29  Vincent Celier  <celier@adacore.com>

	* clean.adb (Gnatclean): Fail if main project is an aggregate
	project or if there is an aggregate library project in the
	project tree.
	* gnatcmd.adb: Fail if the main project is an aggregate project
	or if there is an aggegate library project in the project tree.
	* make.adb (Initialize): : Fail if main project is an aggregate
	project or if there is an aggregate library project in the
	project tree.
	* makeutl.ads (Aggregate_Libraries_In): New Boolean function.
	* prj-makr.adb (Initialize): Fail if the main project is an
	aggregate project or an aggregate library project.

From-SVN: r207255