expr shouldn't use spaces

[dchmelik]

Lately I read about the expr command, which I'm arguing is programmed 
wrong for only working right when you put spaces into expressions rather 
than working for standard mathematical expressions, which don't use 
spaces.  Think back to your mathematics classes: any instructor that 
knows what they're doing doesn't use spaces in expressions.  You don't 
use spaces in graphing calculators.  You don't use spaces in similar 
mathematics software. It's just not the proper writing style.  Expr 
should be switched around or at least configurable to how mathematicians 
and older programmers write versus letting people go with the fad of 
younger programmers who forgot maths classes and write for unnecessaru 
'readability' which actually also looks worse and begins to take up too 
much space.