update SEED and IDEA classification, do a total of broken ciphers

SEED and IDEA are not good ciphers, but not broken, so count them
separately, do a total count of servers that support broken and insecure
ciphers
parse_CA.c - little clean up, add some comments
parse_CA.py - remove obsoleted code

certificate path validation was moved to C application so
remove it from here (it's dead code at the moment anyway)
parse_CAs.py - add support for MD5 sigs
process-certificate-statistics.sh - the script HOWTO to turn results to CA stats