biology/seqtools: 4.33 -> 4.34.1

Blixem

• Added functionality to shift-select a range of coordinates, and copy the reference/match sequence for that range.
• DNA search now highlights the resultant range of coordinates.
• Added a splitter bar to allow the variations track to be resized.
• Dotter Fix a crash pressing Esc on an undocked alignment or greyramp tool.
• All Code reorganisation: the codebase is now in C++ rather than C, and a new module 'gbtools' has been created for generic utility functions.