/*
** COMMAND: bisect
**
** Usage: %fossil bisect SUBCOMMAND ...
**
** Run various subcommands useful for searching for bugs.
**
** > fossil bisect bad ?VERSION?
**
**       Identify version VERSION as non-working.  If VERSION is omitted,
**       the current checkout is marked as non-working.
**
** > fossil bisect good ?VERSION?
**
**       Identify version VERSION as working.  If VERSION is omitted,
**       the current checkout is marked as working.
**
** > fossil bisect log
** > fossil bisect chart
**
**       Show a log of "good" and "bad" versions.  "bisect log" shows the
**       events in the order that they were tested.  "bisect chart" shows
**       them in order of check-in.
**
** > fossil bisect next
**
**       Update to the next version that is halfway between the working and
**       non-working versions.
**
** > fossil bisect options ?NAME? ?VALUE?
**
**       List all bisect options, or the value of a single option, or set the
**       value of a bisect option.
**
** > fossil bisect reset
**
**       Reinitialize a bisect session.  This cancels prior bisect history
**       and allows a bisect session to start over from the beginning.
**
** > fossil bisect vlist|ls|status ?-a|--all?
**
**       List the versions in between "bad" and "good".
**
** > fossil bisect ui
**
**       Like "fossil ui" except start on a timeline that shows only the
**       check-ins that are part of the current bisect.
**
** > fossil bisect undo
**
**       Undo the most recent "good" or "bad" command.
**
** Summary:

**  * fossil bisect bad ?VERSION?
**  * fossil bisect good ?VERSION?
**  * fossil bisect log
**  * fossil bisect chart
**  * fossil bisect next
**  * fossil bisect options
**  * fossil bisect reset
**  * fossil bisect status
**  * fossil bisect ui
**  * fossil bisect undo
*/
void bisect_cmd(void){
  int n;
  const char *zCmd;
  int foundCmd = 0;
  db_must_be_within_tree();
  if( g.argc<3 ){