$GS_HOME/alt_bin/products.st :: Provide information on the downloaded GemStone versions

[dalehenrich]

• [x] create basic script class
• [x] translate pharo help text (use devKitCommandLine <command-name> --help to see help text) into gsdevkit_launcher format
• [x] add symbolic link from alt_bin to tonel script class file
• [x] implement command functionality
• [x] (N/A) implement Smalltalk API (some commands will be used internally by other scripts and a Smalltalk API is essential to making this possible)
• [ ] add test
• [ ] identify the bash scripts that use the command (grep -r devKitCommandLine)
• [ ] edit bash scripts to call the new script