Support for user-installable board definitions in sketchbook directory.

What change would like to see?

Support for additional board files in the SKETCHBOOK/boards folder.  These 
should be individual 
text files (.txt extension), whose name is the identifier for the board (e.g. 
diecimila.txt).  Then 
the board identifier doesn't need to be used a prefix for each property in the 
file.

Why?

Allows users to install additional boards and retain them across upgrades of 
the Arduino 
software.

Would this cause any incompatibilities with previous versions?  If so, how
can these be mitigated?

One question is what to do with the official boards.  Do they stay in a single 
boards.txt file?  
Otherwise, how do we specify their order in the menu?

Original issue reported on code.google.com by dmel...@gmail.com on 6 Sep 2009 at 8:08

jung6717 / arduino

Support for user-installable board definitions in sketchbook directory. #108