- remove spurious spaces and tabs at end of lines
  - make sure if, while, for, switch has a space before the opening '('
  - make sure no line has more than 80 chars
  - move initializations to the declaration line where possible
  - bitwise, logical and arithmetic operators have spaces before and after,
    improving readability of complex expressions
  - use named initializations in structs
  - minor size optimizations

Sizes:
Before:
   text    data     bss     dec     hex filename
  13024    1152       8   14184    3768 net/core/neighbour.o
After:
   text    data     bss     dec     hex filename
  12880    1152       8   14040    36d8 net/core/neighbour.o