Improve POP code, move most of it into a separate file.
(mbx_delimit_end, mbx_delimit_begin): Check for errors. (mbx_write): Check for errors and for From line. (pop_retr, popmail): Use subroutines in pop.c to do the real work. (get_errmsg, multiline, getline, putline, pop_stat, pop_command) (pop_init): Functions deleted.
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