Add online help system#75

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ln2max wants to merge 16 commits intomasterfrom

interactive-help

Commits on Oct 16, 2019

add very basic interactive help
ln2max
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use docstrings to generate a crude help system
ln2max
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minor logic fixes
ln2max
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Commits on Oct 17, 2019

run thru black -l 79
ln2max
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Commits on Oct 19, 2019

update documentation. commit also contains miscellany
ln2max
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update installation requirements
ln2max
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add manpage installation for debian-based systems
ln2max
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Commits on Oct 20, 2019