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This version also tightens up the 'p *' response.  It doesn't show anything that's flagged "Not in context"

Whilst convincing cobcd to compile the NIST COBOL85 test suite, I learned
that the cobc compiler creates temporary files locally, which causes havoc
when there are file name collisions.  I was very pleased with myself when
I figured out that I could rename the source file to something weird, and
avoid collisions that way.  But very late in the game I became aware that
the debugger was looking for the weird source file, and not the original.

This needs to be revisited, but for now I am just going back to the "may
cause collisions" version.

Couldn't run it ... no instructions. See added lines to demonstrate 'MOVE CORRESPONDING' to avoid FUNCTION NUMVAL(). Quick look, more to be said on a non-StPats day.

The prior commit had a version of COBCD that did a 'cd /tmp' to do the compilation.  But that
failed on a COPY SOMEBOOK IN ../ALTDIR.  So, this version copies SOURCE.CBL to SOURCExXxPID
and does the compilation on that file, giving control over the file naming and avoiding
collisions in the original folder.

This is the version of the COBCD that converts command-line file references to absolute,
and then changes the CWD to /tmp/<something>, and does the compilation there.  This
prevents the intermediate files from colliding in the original source directory.
There are two cases that still fail: One because of a COPY SOMETHING IN ../ALTDIR, and
another because of (I believe) a GnuCOBOL debugging-related environment variable.

Still doesn't work quite right, though.  cobst isn't getting the base symbols from
the generated files.  Working on it....