Add compression checks and verify switch
Add compression checks and verify switch

Compression now checks for version and edition:
-lt 2008 - say no
-eq 2008 - only if Enterprise
-ge 2008R2 - go on then

Verify also available, pipes out to restore-dbadatabase for that

fixes #861

Splaxi/dbatools,dsolodow/dbatools,kozloski/dbatools,wsmelton/dbatools,SirCaptainMitch/dbatools,alevyinroc/dbatools,sqlpadawan/dbatools