Improving regression test; allow build of all example sketches for given board.
Improving handling of strings.

1. New definition of program memory strings, str_P.
2. Updated program memory string macro, PSTR().
3. Cleanup class String to use PSTR() instead of F().
4. Large ripple effect on usage of const char*. Convert to str_P.
Update benchmark runs.
Improve string handling in drivers and example sketches.
Fix SoftUART putchar() return value; Should not be sign extended.
Fixed Arduino Mega2560 upload maximum size; Should be 4 Kbyte less.
Fixed DHT driver; ripple effect after introduction of Interrupt::Handler::clear().
Removed debugging support.
Fixed number of analog pins.
Optimizing the ST7735 device driver.
Fixed DHCP request parameter block; missing END_OPTION.
Remove temporary update.
Refactoring String output operator; moved from IOStream to String.

1. Improving handling of end of line string.
2. Predefined strings for CR, LF, CRLF.
Check refactoring of String/IOStream.
Clean up; improve coding style and strengthen interfaces.

1. Rerun benchmarks to gather new statistics.
2. Unify code style for empty member functions and constructors.
Adding tool and protocol to breadboard; support ArduinoISP.
Adding a new release; 2014-09-05.
Adding a new release;2014-09-05.
Allow default setting of ARDUINO_DIR for Cosa build script.
Adding sketch size print to build script driver; tutto

1. Adding logs for the build with both arduino versions to allow
study of compiler optimization changes (eg lto).