Eliminate shell script wrappers for gst-*

These are replaced by a single wrapper written in C (it is
needed to 
handle -I and --kernel-directory).  The same wrapper is used
also for 
gst-blox for portability (on Windows we don't rely on #!
anymore).  In 
the build tree, gst-package will be invoked as (for example)
"./gst-tool 
gst-package"; no more complications with the GST and
GST_ARGUMENTS 
environment variables, and no contortions using
"eval" in the shell scripts.

The C wrapper gst-tool.c also subsumes scripts/Getopt.st,
which is gone. 
  It implements an option parser compatible with the
Smalltalk one (in 
the Getopt class), though lacking a few features that are
not needed by 
the wrapper.

This prompted to add a couple more features to the File
class, most 
notably "File executable" (path to the current
executable).  This is 
needed to merge --load and --test into scripts/Package.st
(they were 
handled by the shell script wrapper).

In the relative near future, scripts/Convert.st will also be
handled by 
the same mechanism.

This more or less concludes the package implementation for
3.0 (I still 
may add a couple things from Mike Anderson's PackageUtils
code).

Paolo

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