scan all the machines from top-1m.csv file, wait for completion

i=1 is an off-by-one-error

support also top-1m.csv files with less or more than 1000000 sites

make sure to wait for completion of all scans
parsing of signature algorithm and key size

add parsing of signature algorithm and key size from the individual
results, report summary
correctly handle also SSLv2 servers

previously SSLv2 ciphers would end up showing up as most preferred,
that's not the case for any new client and breaks other statistics