Updated copyright notices to include the year 2018.

Updated copyright notices to include the year 2017.

global: Added missing copyright notices.

global: Require comparisons to be strict boolean expressions * No implicit integer -> boolean or pointer -> boolean conversions * !expr can be used only if expr is boolean type These were checked with a patched clang. It found various actual bugs, which were fixed by the previous commits.

global: Replace buffer_get_used_size(buf) with buf->used Doesn't make any diffence to code generation, but it's somewhat simpler code. It's also more consistent since most of the code nowadays uses the ->used.

Changed buffer_free() and buffer_free_without_data() APIs to take ** pointer which is set to NULL instead of hiding it with a macro. --HG-- branch : HEAD

All password schemes can now be encoded with base64 or hex. The encoding is ".b64", ".base64" or ".hex" suffix in the scheme, eg. {plain.b64}. Password scheme verification function can now be set to NULL, in which case the verification is done by generating a new crypted password from given plaintext password and comparing it. --HG-- branch : HEAD

Based on password length detect if it's hex-encoded or sha1-encoded. Also use MD[45]_RESULTLEN macros instead of hardcoded 16 value. --HG-- branch : HEAD

Buffer API change: we no longer support limited sized buffers where writes past limit wouldn't kill the process. They weren't used hardly anywhere, they could have hidden bugs and the code for handling them was too complex. This also changed base64 and hex-binary APIs. --HG-- branch : HEAD

Added Compuserve RPA authentication. Patch by Andrey Panin. --HG-- branch : HEAD