Add headless support#120

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randshell wants to merge 12 commits intoangristan:masterfrom

randshell:headless

Commits on Aug 22, 2020

Add headless support
randomshell
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Allow custom IP and NIC in headless mode
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Add headless documentation
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Allow a default IPv6 NIC
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Exit if the client exists
randomshell
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Commits on Aug 23, 2020

Suggest the host bit of IPv4 when asking for the host bit of IPv6
randomshell
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Merge client's IPv4 and IPv6 questions
randomshell
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Exit if the client IP is in use
randomshell
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Allow headless user revokation by CLIENT_NAME
randomshell
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Clarify the client IP assignment
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Commits on Sep 6, 2020

Fix substitution for the server IP
randomshell
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Fix CLIENT BIT suggestion
randomshell
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