in the chains menu, CHAINS_NOEXT file gets clobbered by bout.cls()

[ericpareja]

if a file GFILES\CHAINS.MSG exists, it should be displayed right before the list of chains are shown.
but in show_chains(), bout.cls() erases it, defeating the purpose of CHAINS_NOEXT.

suggested fix:

move the line:
bout.printfile(CHAINS_NOEXT);
from do_chains() to show_chains() right after the bout.cls();

[ericpareja]

patch to be included in future chains fix bundle.