* plugins/tools/execute.c: Make parsable lines distinct by adding
	a "Click me" description in the message. Allow tools to open arbibrary
	file in editory using gdb-styled annotation (The line starts with two
	\032 characters followed by the file:line).

	* plugins/tools/scripts/prepare-changelog.pl,
	plugins/tools/scripts/tools-2.xml.in: Fixed to add changelog entry in
	ChangeLog file itself and open it.