Simple components for Ada 2.5

Simple components for Ada library is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
As a special exception, if other files instantiate generics from this unit, or you link this unit with other files to produce an executable, this unit does not by itself cause the resulting executable to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why the executable file might be covered by the GNU Public License.
Enhancements:
- Functions Is_In were added for doubly-linked webs and lists. GPS project files were added for GNAT users.