bug 1607 - ensure that NYQ_MAX_LEN is big enough on all supported pla…

[SteveDaulton]

bug 1607 - ensure that NYQ_MAX_LEN is big enough on all supported platforms

Resolves: #1607

(short description of the changes and the motivation to make the changes)
Define NYQ_MAX_LEN as LLONG_MAX as this is the same on all supported platforms, whereas LONG_MAX isn't.

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• [x ] The title of the pull request describes an issue it addresses
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• [x ] There are no behavior changes unnecessary for the stated purpose of the PR

Recommended:

• [x ] Each commit compiles and runs on my machine without known undesirable changes of behavior