sxacl: major code cleanup and other improvements (bb#560)
aes-256-cbc-hmac-512 + bcrypt (bb #693)

crypt_blowfish: disable assembly on x86 (not included)
bump version numbers, change filter UUID
compatibility with older OpenSSL
Use time window for ETA computation

Keep information about current transfer speed in time window to properly
estimate finish time.

sxcp progress handling cosmetics (braces && indentation).
Progress bar cosmetics

Prevent progress bar flashing when frequent transfer changes occur. This
is mainly applicable on resumes and transfer retries.
Print progress information to stderr instead of stdout
Code cosmetics

Change indentation
Silence compiler warnings

Change few local variables types from int to unsigned int that are used as array indices. That stops warnings about comparing signed and unsigned variables.