make persistent serial port selection in ide

[bnewbold]

Original author: mbolivar...@gmail.com (November 16, 2010 09:13:32)

it seems that the serial port selection in the tools menu is often lost during programming when the serial port goes away. Some users are reporting the need to continually select the serial port before each programming. We should be able to add something to the preferences file to force selection of that serial port, if possible, every time.

Original issue: http://code.google.com/p/leaflabs/issues/detail?id=20