Pulses time functions.

pre pre PRE ALPHA, do not use...

struct time {
  unsigned long time;
  unsigned int overflow;
};

time now;
time last_now;
time global_next;
unsigned int global_next_count;
int * global_next_pulses;

init_time();
get_now();
add_time();
sub_time();
mul_time();
div_time();
add_time();

Fixed keywords.txt