WIP: data compression
base 128 variable length integers
test for base128 variants
stream reader/writer for base128 format
delta encoding stream
add rle encoding and tests for rle and delta-rle
WIP: compression
WIP: compression in sequencer
WIP: compressed page format
WIP: compression support in Storage class
fixed error in 'advance_volume' procedure
correct error handling in merge_and_compress
Compressing logic moved to PageHeader
working on chunk decompression procedure
WIP: refactoring scan procedure to ease compression implementation
refactoring finished, tests isn't happy
all tests are happy now
test for page decoding added
tests fixed
zig-zag coding implemented, delta-rle for offsets enabled