sshell pipes (also) the input of the run process - it does not use the input
    pipe.  dubious useful feature and one to document - or revise.
--no-dd option for at least express17 and aime
nodetype section for each library exported data type
the info for nodetype.free is not describing some argument - it is now, should
    expand into an article - update example for decq
closeexec in lxport.xshell - only after fork, in main process
study _move_list use of _mind_list
reenable configure search for libx1f4i0 once aime is removed from libx1f4i0
    -- it seems that some files looking to include libx1f4i0.h do not include
       config.h
fix the `swap' method in 1f4/xalist.c (as for e2list)
hack_expression does not detail error, shamefully
improve on copy.h so no tests are done for fixed size collections such as rates
e4 is not using c1_empty_string.  maybe it should.
it looks as if lxbail is expecting the (extended?) libaime c3? layout
    (ln.h.x1f4_leadnode_type).  as such, it requires an undocumented object
    layout.
improve the layout of structures such as a1 shuffle, c1 program
