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Add/correct some comments in paren_infix

Restructure some logic in gather_args to avoid redundant computation.
This may also make the code easier to read.

Cleanup: Remove code that looks useless.
By inspection, if max is less then zero, then set to zero, it
will immediately be decremented back to a negative value.

Cleanup: remove inparen parameter from gather_some_args.
This hasn't been used since bug #566 was fixed.

Fix a typo in a comment

Rename gather_more_args to argument_is_available and add "const" to the argument.
This emphasizes that the function is a simple predicate with no side-effects.
That is, it doesn't gather anything, it just says whether an argument could be gathered.

Declare gather_some_args as static, since it is not used outside this file.

Add/improve some comments

Remove an incorrectly placed comma in a comment

Improve the wording of the first paragraph of BITSAVE.
At first, I only wanted to clarify that

> It also allows you to add more work to an existing piece of work.

means it overwrites a file (at least that's what I think it meant), but after updating that, it triggered a complete rewrite of the paragraph.