new bin directory separated out of pymodel directory

new README in pymodel and bin

Author: jon-jacky

bin/README.md

@@ -0,0 +1,34 @@
+
+bin directory
+=============
+
+This directory contains the commands for PyModel.
+
+To use PyModel, this directory must be on your execution *PATH*.
+Or, its contents must be installed in some directory that is on your
+execution *PATH*.
+
+There are two versions of some commands.  The version without a
+file type is a *bash* script for Unix/Linux/Mac; the version with
+*.bat* is a batch file for Windows.
+
+The commands are:
+
+- *pma*, *pmg*, *pmt*, *pmv*: the four main PyModel commands.  They
+  just invoke the Python modules with the same names in the *pymodel*
+  directory.  See *commands.txt* in the *notes* directory, or print
+  their built-in help by typing *pma -h* etc.
+
+- *clogdiff*: works with trun.py to execute and check
+  regression tests.  See *test.txt* in the *notes* directory.
+
+- *dotpdf*, *dotps*, *dotsvg*: invoke the Graphviz *dot* program to
+  produce *.pdf*, *.ps*, or *.svg* graphics files from the *.dot*
+  files generated by *pmg*
+
+- *tpath*: put the current directory *.* (dot) on *PYTHONPATH*. This
+   is needed by the PyModel programs *pmt* etc., which all import
+   Python modules in the current directory that are named on the command line.
+
+
+Revised Apr 2013