Added help for 'external' command.

git-svn-id: http://yate.null.ro/svn/yate/trunk@5818 acf43c95-373e-0410-b603-e72c3f656dc1
Added discrimination between boolean and integer values.
Return proper results for typeof and toString() calls for boolean values.



git-svn-id: http://yate.null.ro/svn/yate/trunk@5819 acf43c95-373e-0410-b603-e72c3f656dc1
Merge branch 'upstream' of github.com:vir/yate into deb
Updated debian package version to 5.2.1~svn5819