getopts: rename add method to add-opt.

The reason for this rename is that add is a public symbol in
the usr package, thanks to the build macro. This will
interfere with an upcoming feature under which options appear
directly as struct slots, defined by symbols. If a user
defines an --add option using the symbol add, it will clash
with the add method. But add-opt will be sys:add-opt.

* share/txr/stdlib/getopts.tl (opts add): Rename to add-opt.
(sys:opt-processor parse-long, sys:opt-processor
parse-shorts): Follow rename.

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