sheet2pcp - change use Spreadsheet::Read
sheet2pcp - change use Spreadsheet::Read

Use an equivalent require + import() construct to still use the
Spreadsheet::Read module, but give us the chance to warn and explain
to the user if it is not installed.

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