Change pmafm to replay multi-archives with multiple -a arguments.
Change pmafm to replay multi-archives with multiple -a arguments.

Currently it uses the dodgey comma-separated way, which pmchart
does not accept, and which doesn't work for archives with commas
in the name.  All tools which specify "multi" in pmafm config do
work this way, from a quick audit.

mbaldessari/pcp,prasincs/pcp,tjanez/pcp,prasincs/pcp,adfernandes/pcp,edwardt/pcp,wuliming/pcp,adfernandes/pcp,tjanez/pcp,prasincs/pcp,ryandoyle/pcp_original,tjanez/pcp,mbaldessari/pcp,adfernandes/pcp,edwardt/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,aeg-aeg/pcpfans,ryandoyle/pcp_original,prasincs/pcp,mbaldessari/pcp,ryandoyle/pcp_original,aeg-aeg/pcpfans,edwardt/pcp,adfernandes/pcp,ryandoyle/pcp_original,mbaldessari/pcp,wuliming/pcp,andyvand/cygpcpfans,prasincs/pcp,aeg-aeg/pcpfans,edwardt/pcp,prasincs/pcp,adfernandes/pcp,wuliming/pcp,edwardt/pcp,edwardt/pcp,andyvand/cygpcpfans,tjanez/pcp,aeg-aeg/pcpfans,prasincs/pcp,mbaldessari/pcp,tjanez/pcp,tjanez/pcp,adfernandes/pcp,andyvand/cygpcpfans,ryandoyle/pcp_original,tjanez/pcp,edwardt/pcp,wuliming/pcp,tjanez/pcp,prasincs/pcp,adfernandes/pcp,ryandoyle/pcp_original,wuliming/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,ryandoyle/pcp_original,aeg-aeg/pcpfans,andyvand/cygpcpfans,aeg-aeg/pcpfans,adfernandes/pcp,mbaldessari/pcp,wuliming/pcp,andyvand/cygpcpfans,wuliming/pcp,wuliming/pcp,ryandoyle/pcp_original,andyvand/cygpcpfans,edwardt/pcp