A some windows systems is really slow to create the DB. Supply a blank DB

if created DB on windows is the same than on linux {
Then create_release.sh will have to execute chronojump in a way that a db is created for that chronojump version. 
create_release.sh will name this chronojump_blank.db
if installjammer found a chronojump.db it would do nothing. If not, it will copy the blank db as chronojump.db
}
else {
i will have to create DB manually on windows and linux
create_release.sh will remember this
both will be blank as above, but named chronojump_database_blank_windows.db and chronojump_database_blank_linux.db
installjammer will do same as above but selecting correct blank DB
}