Add static method conv to keep track of convention (not used yet).
Move conv.m out of braid class.
Add comments to conv.
No return value when setting properties.
Rename conv to prop, to avoid name clash with convolution.
Split off mtimes from braid.m.  Implement direction convention GenRotDir.
Add GenOverUnder property.
Add test_global_vs_prop.m to see if there's much of a speed hit.
Add BraidPlotDir property.
Change GenOverUnder to GenPlotOverUnder.
Implement LoopCoordsBasePoint for the loop coordinates.
Merge branch 'develop' into iss64-other-conventions
Merge branch 'develop' into iss64-other-conventions
Add GenLoopActDir property.
Store properties in a struct, to easily return them all.
Merge branch 'develop' into iss64-other-conventions
Update CHANGELOG.
Short section on properties in manual (#64).
Add missing figure.
Merge branch 'iss64-other-conventions' into develop.  Resolves issue #64.