Commits on Jul 19, 2016

1. scandir.c: traverse in consistent order …

   `readdir()` returns directories in an implementation-dependent order.
   In practice it's based on a hash of the filenames, aka random:
   
       $ ls
       01.txt  02.txt  03.txt
   
       $ ag -l hello
       02.txt
       03.txt
       01.txt
   
   This commit calls `qsort()` on the output of `readdir()`.
   Now, results are almost always sorted alphabetically:
   
       $ ag -l hello
       01.txt
       02.txt
       03.txt
   
   This doesn't guarantee 100% sorted order - worker threads will still
   race each other - but 99% of the time it will be sorted completely.
   
   This means you can largely expect to get the same `ag` output on
   different OSes or different checkouts. Plus, if you're running a slow
   `ag` command and see the "foo" directory:
   
       $ ls
       ack  bar  foo  quux
   
       $ ag hello
       foo/hello.txt
       1:hello
   
       ...
   
   you can be sure there are no matches in "ack" and "bar".
   
   This commit partially fixes ggreer#107.

   

   bmalehorn committed Jul 19, 2016
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