Lots of small bugfixes (lint!).
Made bgn_group and end_group form methods instead of top-level functions.

wholly empty lines interactively.

For the latter we must keep track of the current block's type.
(We can't continue through a try statement, sigh.()

from C.

Fix argument handling bug in socket(f,t,p) call.
Fix some comments.

Hope the best for MPW 3.

are the same -- 0 and 0.0 compare equal but should be considered different
here!

if other users present in queue.

Print ';' instead of ',' between file and line for MPW.