Add a bunch of seed messages for GENERAL.

batch/batch.go

batch/messages.go

batch/seed/1982b-aaareadme.txt

batch/seed/1982b-bcmail.txt

batch/seed/1982b-bullintro.txt

batch/seed/1985c-aaareadme.txt

batch/seed/1985c-announce.mai

batch/seed/1985c-bullet.mai

batch/seed/1985c-bulletin.txt

batch/seed/1985c-file1.mai

batch/seed/1985c-file2.mai

batch/seed/1985c-file3.mai

batch/seed/1985c-file4.mai

batch/seed/1985c-file5.mai

batch/seed/1985c-instruct.txt

batch/seed/1986c-aaareadme.txt

batch/seed/1986c-bulletin.txt

batch/seed/1987a-bulletinann.txt

batch/seed/1987d-bulletin.txt

batch/seed/1987d-bulletinann.txt