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Update the build instructions based on the experience of pachleng:
* Replace references to "gmake" with "make"
* Suggest building wxWidgets on an SSD

Add updates to the Simplified Chinese translation (contributed by Test Down)

Elaborate the instructions for building wxWidgets based on feedback from Test Down.

Integrate the Simplified Chinese translation into the build.

Rebuild the Simplified Chinese translation header file to include the NOT_YET_TRANSLATED marker.

Fix Bug #488; Basic movement commands (FD, RT, etc) no longer leak memory when given numbers that were originally parsed as text. The fix is to add a missing gcref() call to free the converted value NODE*.

Document that PIXEL can output a color-by-index under certain conditions.
Fix an inaccuracy in the PIXEL example.
Other minor cosmetic changes.

Add a missing semi-colon.

Replace 'REPEAT ### [ MAKE "x WORD :x "A]' patterns with uses of REPEATWORD.
This is more time and space efficient and it makes the calling tests more readable.

Make REPCOUNTTEST.TIMERTEST more space efficent by changing a counter that involved string concenation to an incrementing integer. This is equally effective at testing repetition, but it uses less memory and causes less work for the garbage collecter.