Update quickReference document.  Added an extern section and const in/ref types.

[Reviewed by Brad]

Added a section on extern procedures and variables and added const in and
const ref to the list of argument intents.  Reformatted slightly to avoid
breaking sections across columns and to keep it to two pages.


git-svn-id: http://svn.code.sf.net/p/chapel/code/trunk@22044 3a8e244f-b0f2-452b-bcba-4c88e055c3ca
Adding skipifs for tuple futures

These futures like all the others in the directory can pass if they
get lucky for --no-local and baseline, so I added a skipif to them
like the others.




git-svn-id: http://svn.code.sf.net/p/chapel/code/trunk@22045 3a8e244f-b0f2-452b-bcba-4c88e055c3ca