rename contra_flow to travel_mode, use unsigned char
add failing tests for travel mode
first cut at porting travel mode, some tests fail
most tests passing
use 4 bits for travel mode
improve tests for travel mode
fixes
more tests passing
fix initialization order to avoid compiler warning
remove spurious comment
remove unneeded methods
remove comment
reactivate assert of sizeof(NodeBasedEdgeData)
profile fixes
fix compilation of tests
fix problems with mode, 1 failing test left
rename test
reduce failing test
add a few tests
remove bitfield from SegmentInformation, works around compile err