Fixes: Issue 9
When debugging is disabled, messages with a prio of DEBUG get stored in d_buf, which is a ring buffer of 64 lines; on enabling debugging, the contents of this buffer are flushed to the (status) tab. Consequently, if something strange happens and you want to debug it, you can read all the debugging info about what just happened; but all that debugging info won't fill up buf 0 and cause visible messages to disappear from the (status) tab when debugging is disabled.
Makes /set mnln, /set prefix retroactive (and makes other goodness possible in the future)
Is generated by genconfig as part of 'make doc'. Also made some small improvements to genconfig and updated some documentation. The default value of force-redraw is now 0 (was 2).