master updated (c585ca89a6 -> b8eef7b8c1)

[Jim Porter]

jporter pushed a change to branch master.

      from  c585ca89a6 * lisp/bs.el: Use modern height preserving method 
instead of hooks
       new  66ac920b0c Support completion of variables with the length operator 
in Eshell
       new  e63ef66c57 Add support for the "splice operator" in Eshell
       new  b8eef7b8c1 ; Rename 'eshell-flatten-args' token to 
'eshell-splice-immediately'


Summary of changes:
 doc/misc/eshell.texi               | 100 +++++++++++++++++++++++++++----------
 etc/NEWS                           |  10 ++++
 lisp/eshell/em-cmpl.el             |  26 ++++++----
 lisp/eshell/em-unix.el             |  12 +++--
 lisp/eshell/esh-arg.el             |  83 ++++++++++++++++++++++++++++--
 lisp/eshell/esh-cmd.el             |  15 ++++--
 lisp/eshell/esh-util.el            |   6 ++-
 lisp/eshell/esh-var.el             |  35 +++++++++----
 test/lisp/eshell/em-alias-tests.el |   9 ++++
 test/lisp/eshell/esh-var-tests.el  |  74 +++++++++++++++++++++++++++
 10 files changed, 308 insertions(+), 62 deletions(-)