Additional xterm-mouse cleanup

[Jared Finder]

I've got four small patches for my continued work to make xterm-mouse function better. #1 also makes Linux terminal function keys behave better when running help-for-help and #2 and #3 both improve GPM-based mouse behavior too.

I'd like feedback in particular on patch #4, which is small but in a sensitive location -- it's one additional code line in read_key_sequence along the input-decode-map path. I considered instead putting the change as part of the other cleanup right after replay_sequence, but ultimately thought that would be riskier and serve no additional purpose.

Let me know your thoughts.

  -- MJF

0001-Improve-behavior-for-make-help-screen.patch
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0002-lisp-tab-line.el-tab-line-new-tab-Use-tty-menus-when.patch
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0003-Support-mouse-autoselect-window-for-GPM-and-xterm-mo.patch
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0004-Echo-area-stays-visible-when-moving-xterm-mouse.patch
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