Masterscope expanding macros

[MASINTER]

I fixed it so that masterscope expands any macros of MSMACROPROPS,
initially = (MACROS). 

It works for OPENLAMBDA too (I think the PDP-10 compiler works
for OPENLAMBDA too). I moved the code for macro expansion to
the file MACROS (rather than DWIM). New entry

(MACROEXPANSION form macroprop)
     given the macro property "macroprop", MACROEXPANSION does
     the expansion.

(GETMACROPROP fn props)
     (maybe this should be renamed?) It actually just returns 
     the first property of "fn" out of props.

Larry