will now pick the most preferred font from the list (first member)

fix two problems in block positioning: must allow for no columns in a strand set, blocks within one alignment must not be bumped over.

invisible default insensitive colour!

removed unused function

made it work and removed some unused code

the window to get events from the whole "window" in one place, and add
a reasonable sized border, which  can be coloured using resource files
or gtk_widget_modify_{b,f}g().

changed from char* to g_string for digits, should mean less alloc/frees

add functions to extract dna subsequences from main displayed sequence on coords or simple features or transcript features.