Added ExecToStack

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@1814 212acab6-be3b-0410-9dea-997c60f758d6

Contrib/nsExec/nsExec.txt

@@ -12,8 +12,13 @@ nsExec::Exec [/TIMEOUT=x] path
 
 nsExec::ExecToLog [/TIMEOUT=x] path
 
-Both functions are the same except ExecToLog will print the output
-to the logwindow.
+-or-
+
+nsExec::ExecToStack [/TIMEOUT=x] path
+
+All functions are the same except ExecToLog will print the output
+to the logwindow and ExecToStack will push up to ${NSIS_MAX_STRLEN}
+characters of output onto the stack after the return value.
 
 The timeout value is optional.  The timeout is the time in
 milliseconds nsExec will wait for output.  If output from the