RdWr - fix and more tests
RdWr - more tests
RdWr - tests for error and read()
RdWr - test both Read and Readahead with same tests
RdWr - test that data is padded before offset
Rdwr - sysread integration test for zero-paddings improved
Rdwr - zero padding test + fix zero padding should happen if eof found in the beginning
RdWr - Read/Readahead - should pad buffer with zeros before doing anything
RdWr - zero padding improve tests
fix numer of tests