Rewrote text output to a file target. This fixes various problems:

- Slow because of the large number of actions and line counting.
- Somewhat kludge behaviour when doing actions outside of the text rule.
- Terse documentation.


[SVN r18870]

tools/build

@@ -1 +1 @@
-Subproject commit 059b164b4c64e65e9d893b7682c20f25234bdc99
+Subproject commit 6a48f2b8c490c89c882adeeb4332efbcba9dd689