Commits on Oct 13, 2022

1. ipv6 abbreviated address support …

   This will support ipv6 addresses that are abbreviated with `::` such as
   ::1 (for 0:0:0:0:0:0:0:1) with some caveats around specifying the port
   in the host positional argument.
   
   Help output:
   
   ```
   $> ./et --help
   Remote shell for the busy and impatient
   Usage:
     et [OPTION...] [user@]host[:port]
   
     Note that 'host' can be a hostname or ipv4 address with or without a port
     or an ipv6 address. If the ipv6 address is abbreviated with :: then it must
     be specfied without a port (use -p,--port).
   
     -h, --help                 Print help
         --version              Print version
     -u, --username             Username
         --host arg             Remote host name
     ...
   ```
   Tests:
   
   ```
   $> ./et ::1 -p 8080 --macserver
   $> ./et 0:0:0:0:0:0:0:1 -p 8080 --macserver
   $> ./et 0:0:0:0:0:0:0:1:8080 --macserver
   $> ./et ::1 -p 8080 --macserver # fails because defaults to port 2022
   ```
   Fixes MisterTea#537

   

   jshort committed Oct 13, 2022
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