Fixes for KeePass format's valid()

Several causes for segfaults caused by specially crafted hashes
have been fixed (or at least the probability has been reduced).
Fixes for Bitcoin format's valid()

Several causes for segfaults caused by specially crafted hashes
have been fixed (or at least the probability has been reduced).
Fixes for 7-Zip format's valid()

Several causes for segfaults caused by specially crafted hashes
have been fixed (or at least the probability has been reduced).
Fixes for 1Password Cloud Keychain format's valid()

Several causes for segfaults caused by specially crafted hashes
have been fixed (or at least the probability has been reduced).
Fixes for gpg format's valid()

Several causes for segfaults caused by specially crafted hashes
have been fixed (or at least the probability has been reduced).
Format LastPass, sniffed sessions, additional check in valid()

This fixes a possible segfault, or at least reduces the probability.
Fixes for ODF format's valid()

Several causes for segfaults caused by specially crafted hashes
have been fixed (or at least the probability has been reduced).
Minor improvement of PBKDF2-HMAC-SHA512 format's valid()
Replace 2147483647 with INT_MAX in valid()

in several formats recently changed by me in previous commits
Merge pull request #483 from frank-dittrich/bleeding-jumbo

Improvements for several valid() functions