[PD] expr update for 0.48

[Alexandre Torres Porres]

Howdy Shahrokh, Miller and pd-list, the release notes of 0.48 mention this:

"The expr family (expr, expr~, fexpr~) got an update from Shahrokh
Yadegari. I'm not sure when this first came about, but expr now can access
"variable" objects as variables inside expressions. Expressions using "if"
skip evaluating the argument that isn't used."

well, the expr family can access variable objects since version 0.4 (which
I do not know when got into Pd). As from version 0.5 (which made into Pd by
0.47, I think), you could also give it a value by using the new "=" syntax.
Like: [expr x = 3] changes the value of a [v x] object.

Now we have version 0.55 up, and I do not know what's new about variables,
maybe nothing? So we could change the notes to what's asctually new. Here's
a list  Shahrokh sent me though, since I was testing and reporting a few
bugs.

2017-07-14 21:08 GMT-03:00 Shahrokh Yadegari <sdy at ucsd.edu>:
>
>      - Expr Version 0.55
>
>        - The arrays now redraw after a store into one of their members
>
>        - The "if()" function is reworked to only evaluate either the left
> or the right arg      depending on the truth value of the condition.
>
>          However, if the condition is a vector,  both the left and the
> right are evaluated regardless.
>
>        - The maximum number of inlet and outlets (MAX_VARS) is now set at
> 100
>
>        - The bug of using store "=" in functions with multiple arguments,
> which caused an error during execution, is fixed.
>
So, Shahrokh, I get all of this but the "bug of using store "=" in
functions with multiple arguments", I don't think I reported that one,
would you care to elaborate on it?

Miller, we seem to still have an issue creating [expr] with atanh()
,asinh() and acosh() on windows - such as in [expr atanh($f1)]. Are you
working on it for the final release of Pd 0.48?

Thanks
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