printf format/argument mismatch

When the variable $unsafecall is set, override the standard checking
of actual vs. formal argument types in the call command.

Add copyright

update to version 3.0

eliminate extraneous parameter

merge linton branch delta trail

branch delta of linton changes from net.sources

fix findframe, it had been skipping a stack frame for each scope
block instead of checking to see if a stack frame existed for the block

updated for revision to signals

modified traceback to deal with "inline" functions, i.e. blocks
which contain variables but do not have a separate activation record

changed the offset for finding the calling address of a signal handler
to reflect new 4.2 stuff'

added code to recognize non-standard frames put on user stack
by the kernel when interrupts are trapped

fixed problem with line number of top stack frame

fixed a very annoying bug, the routine "findframe" occasionally
hung because it used the wrong test for the last frame. The correct test
involves checking if the saved frame pointer is 0 OR the sa

fixed a very annoying bug, the routine "findframe" occasionally
hung because it used the wrong test for the last frame. The correct test
involves checking if the saved frame pointer is 0 OR the saved pc belongs
to the "program", i.e. the start-up routine.

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uses srcline(pc - 1) rather than srcline(pc) since pc is address
of next instruction

fixed @(#) stuff

date and time created 82/12/15 04:08:35 by linton