regress tests shouldn't set or modify MALLOC_OPTIONS unless they're actually very specific behaviour

document this accordingly in the guidelines section of the manpage

ok bluhm@

Add a variable referencing the csh binary to test.

Add missing RCS IDs and zap redundant SRCS from Makefile.

The first version of the edit program used to test csh, ksh and mail was based
on the following reasoning: once the program to test has written some data it
has entered the main-loop and is by now re

The first version of the edit program used to test csh, ksh and mail was based
on the following reasoning: once the program to test has written some data it
has entered the main-loop and is by now ready to receive user input. At this
point it should be safe to start writing input and once the program once again
enters a blocking reading state, its done processing the input. This approach
was sensitive to timing and determining when a shell is done processing its
input (if ever) is tricky.

This iteration of the edit program takes a new approach and uses presence of a
prompt for synchronisation of I/O. It doesn't solve all problems but is a step
in the right direction.

Joint work with bluhm@

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Add tests for all features of file completion in csh.

Make sure to abort loops when pressing ^C in csh.

Regression found by deraadt@

Add regression tests for the filec feature in csh.