commented out parts of functs.mac. More generally, refereeing "share" or other contributions



in functs.mac, the section on linear and quadratic has been commented out.
I don't know why, but in any case the documentation does not reflect 
that, and has a function "linear".
Oddly enough, if the documentation seems to say that linear(E,x) always 
returns E.
So perhaps several fixes are in order.

I think that the name of the file "functs" could be better.

 It seems to be a quite random collection,
including such low value and obscure functions as   vers(x):=1-cos(x),  
and covers(x):=1-sin(x),
and

Also, while I am being grumpy, I suggest that the author (1) add 
adequate comments, and (2) put his/her name on the file, and a date.

In general it would be even better if the files contained 2 or more 
names.  The author and others who read and approved the file for 
inclusion in Maxima.
 These extra people would act as referees and have the responsibility to 
make sure that the facilities in the file were worthwhile,
had appropriate names and documentation, etc.

RJF