Series import: detect quantity when it ends with asterisks

[php-coder]

m.w.f.s.i.SeriesInfoExtractorServiceImpl : Determine quantity from 'Коморы 2008 ДИНОЗАВРЫ MNH М-лист 6м** EUR 12.'
m.w.f.s.i.SeriesInfoExtractorServiceImpl : Could not extract quantity from a fragment

[php-coder]

This is a little risky as 6м might mean not only 6 stamps but also 6 meters but I hope that the number of false positive will be less than the cases when it's helpful.