Makefile uses proper install cmd, also new check cmd added
Makefile uses proper install cmd, also new check cmd added

vlulla/data.table,vlulla/data.table,jangorecki/data.table,jangorecki/data.table,vlulla/data.table,Rdatatable/data.table,vlulla/data.table,Rdatatable/data.table,jangorecki/data.table,Rdatatable/data.table,jangorecki/data.table,Rdatatable/data.table