fix usdb, console.pl, sh/dx /p and sh/register

06Nov21=======================================================================
1. Improve console.pl scrolling. Split long lines (eg on announcements.
04Nov21=======================================================================
1. Fix illogicalities in USDB creations and make sure that O_CREAT on tie does
   NOT encounter an existing file to barf about. Even though it shouldn't.
   Thanks Howard WB3FFV.
2. Fixed a typo in show/registered that prevents a list of callsigns being
   searched for. Got rid of some over complex code. Thnake Fabrizio iZ0UIN.
3. Fix long line wrapping in console.pl
03Nov21=======================================================================
1. Move motd and issue files to local_data if not already there.
30Nov21=======================================================================
1. Fix sh/dx with callsigns that have /p or VE/G1TLH in them.
2. Add unset/ak1a, unset/arcluster aliases and some minimal help for UNSET/
   SPIDER, NODE, ARCLUSTER, AKIA and also SET/USER.