Correct incorrectly-attributed seclevels for trust script examples

[matr1x-hackmud]

Several of the trust scripts' example code used seclevels which are lower than the minimum seclevel for that trust script. I've done a pass through on all of them and changed them to the appropriate seclevel.

Some other quick fixes that ended up in this PR:

• accts.xfer_gc_to_caller's example was more appropriate for xfer_gc_to, so I remade it
• sys.init cannot be subscripted (hard-blocks at parse time), so I've removed that
• sys.specs and sys.status has an example