Lab #5: More Project #1 checkpoints

This lab is dedicated to progress on Project #1.  You won't need any files
other than the Project #1 skeleton that we provided.  We suggest that
you complete as much as possible of this BEFORE you get to lab, especially
parts 1 and 2.

1. Complete a draft User-Manual.

2. Get your command reader to handle (i.e., to ignore) comments.  According
   to the specification, comments can only appear in the position of 
   commands.  That is, nothing says that users have to be allowed to write

	select SSN Name  /* i.e., identification */ from info ;

   This should make it pretty easy to do.  Caveats: Can you handle this?

	/* This is a comment */ print bar ; /* Another comment */

   You should, according to the specification (and it should print the
   bar table).  Also, this:
	/* This is a two-line
	   comment */ print bar ;

   General hint: It shouldn't require ANY effort on your part to 
   handle ends of lines; the project specification was written so that you 
   could get away with just pretending that ends of lines are blanks.

3. Implement the database.Database, database.Table, and database.Row 
   classes (or whatever collection of classes you have chosen to replace
   these with---whatever serves the function of actually storing data).

4. Describe your implementation of the classes in (3) in the INTERNALS
   manual.

5. Implement the 'load' and 'print' commands.  Please read the updated
   project #1 description (on-line on the HW page): we have gotten a 
   bit more specific about the format of the output of 'print'.