read the hide_initially and directional_end from styles file as well as acedb

also passing style into feature drawing functions

correct bug in destroy callbacks, make sure that configuration window goes away properly, make sure it is updated as cols are hidden.

Get feature or feature set name used as popup menu title, fix strand bugs in use of feature hash code.

make the layout of the dialog more reflect that of the canvas.

hide some cols initially according to style. add configurable col. highlight. Add style description to item display.

change code to deal with columns that are not strand specific and have both forward and reverse strand features in them, e.g. repeats.