Deglobalize prompt_pos

[Leonard den Ottolander]

Hi, 

The use of prompt_pos as a global static variable in subshell.c seems a
bit odd. I've ripped the parameter and it's references out, except of
course in read_subshell_prompt(). This patch also has the "already
running a command" fix integrated.

Things seem to be fine on my box (Fedora Core 1). Please test this patch
on other platforms and tell me if this simplification is correct.

Leonard.

-- 
mount -t life -o ro /dev/dna /genetic/research

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