Import tex-multido-1.42 as devel/tex-multido.

Import tex-multido-1.42 as devel/tex-multido.

The package provides the \multido command, which was originally designed
for use with with PSTricks. Fixed-point arithmetic is used when working
on the loop variable, so that the package is equally applicable in
graphics applications like PSTricks as it is with the more common
integer loops.