[Bf-committers] Note for Branch Maintainers: mul_serie_m3 - arg order & renamed.

[Campbell Barton]

For anyone maintaining their own branch,
mul_serie_m3 and mul_serie_m4 had their argument order reversed
(highly confusing!).

So I've renamed the functions `mul_serie_m3` to `mul_m3_series` and
re-ordered the args in master.

If you use this in a branch the argument order should be changes as follows:

from:  mul_serie_m3(m, e, d, c, b, a);

to:  mul_m3_series(m, a, b, c, d, e);

`mul_serie_m4` must be renamed to `mul_m3_series` but argument order
remains unchanged.

-- 
- Campbell