[JarrettBillingsley]

Not very big, but important bugfixes.

Added/Removed

• Added default parameters for functions. They are simply rewritten as conditional assignments (?=) at the beginning of the function, and as such, can be any expression evaluatable at runtime, and may even reference other parameters (before or after). You can also give default values to parameters which aren't at the end of the parameter list.

Changed

• Added a conditional move instruction to improve the performance of conditional assignments.

Fixed

• Didn't realize that I had broken compilation on Linux by using HighPerformanceCounter in minid.utils instead of just PerformanceCounter.
  
• Fixed os.microTime() on Linux.
  
• Fixed the .brf files.. didn't change them when I reorganized the directories.
  
• Fixed a bug in the compiler with upvalues of multiply-nested functions.

MiniD should now compile and run fine on Linux (it does for me).