Fixes and improvements

In this release issue with big files (more 1Gb) compression was fixed. It affects only stream and streamhigh mode and relates not to algorithm itself, but small problem with data shifting (to allow compression of any length of data). Block mode was not affected by this issue.

Also, command-line executable has a lot of fixes and improvements in command line parsing. Now, --stdin and --stdout options should work correctly, and other options should work as expected.