Use external editor in 'commands' command

[Alfredo Ortega]

Hi all,

I have made a small patch to the 'commands' command to allow the use
of an external editor to add or modify commands. This is convenient if
you are dealing with many commands per breakpoint.
The editor follows the behavior of the 'edit' command (/bin/ex by
default, or the 'EDITOR' environment variable)

Tested on i686-pc-linux-gnu, please tell me what do you think about it.

2009-01-14 Alfredo Ortega <ortegaalfredo@gmail.com>
    * breakpoint.c (commands_command,_initialize_breakpoint):
    Add the 'edit' keyword to the 'commands' command to allow the
    use of an external editor to add or modify commands.
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