scripts pynche.py and pynche.pyw for Unix and Windows startup
respectively.  Document the .pyw file in the README.

Fix bug in NoDefaultRoot() -- _default_root wasn't declared global;
and made it reentrant.

Don't set _default_root to whatever master gets passed in to
BaseWidget._setup() (only set it when we need to create a new Tk()
widget).

Moved buttons to the top

BadColor exception.

make a common case slightly faster.

that Left/Right arrow keys and C-a C-e all work.

Changed Color Ties label to Color Variation Ties

main(): Fixed logic error and reporting when no colordb was found.
Given by GvR.