Fixed Samplevis allele selection glitch, removed TSSV -L
Fixed: * Fixed a glitch in Samplevis HTML visualisations, where it would fail to correctly maintain the user-(de)selected alleles when switching Split Markers on or off. Removed: * Removed -L/--check-length option from the TSSV tool, because it had no effect. Instead, the TSSV tool will always enforce the expected allele lengths specified in the library file. Behaviour has not changed.