Refactored a handful of things in tests

- Now test errors have correct line reporting! #line directives
  are passed to the compiler that reference the relevant line in
  the test case shell script.

  --- Multi-block directory ---
  ./tests/test_dirs.sh:109: assert failed with 0, expected 1
      lfs_unmount(&lfs) => 1

- Cleaned up the number of implicit global variables provided to
  tests. A lot of these were infrequently used and made it difficult
  to remember what was provided. This isn't an MCU, so there's very
  little cost to stack allocations when needed.

- Minimized the results.py script (previously stats.py) output to
  match minimization of test output.

scripts/results.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python2
+
+import struct
+import sys
+import time
+import os
+import re
+
+def main():
+    with open('blocks/.config') as file:
+        read_size, prog_size, block_size, block_count = (
+            struct.unpack('<LLLL', file.read()))
+
+    real_size = sum(
+        os.path.getsize(os.path.join('blocks', f))
+        for f in os.listdir('blocks') if re.match('\d+', f))
+
+    with open('blocks/.stats') as file:
+        read_count, prog_count, erase_count = (
+            struct.unpack('<QQQ', file.read()))
+
+    runtime = time.time() - os.stat('blocks').st_ctime
+
+    print 'results: %dB %dB %dB %.3fs' % (
+        read_count, prog_count, erase_count, runtime)
+
+if __name__ == "__main__":
+    main(*sys.argv[1:])