Small fixes to trace code and trace server.

Trace server capacity is now based on actuall number of outputs,
not on some magic number.
Add name and unit option to command_bool and command_float.
Modify tests to test this.

Add controller_mem memory allocation functions.
All periodic data will be allocated in a continuous piece of memory hoping
for optimall cache behaviour with regards to associativity.
(TODO: really allocate continuous memory at the other side of the MMU)

The frequency keyword has been removed.
The blocks keyword now needs two arguments: frequency (Hz) and delay (seconds)

	modified:   common/log/log.c
	modified:   common/utils/weather.c
	modified:   controller/controller/controller_command.c
	modified:   controller/controller/controller_trace.c
	modified:   controller/shell/shell.c

	Don't use PTHREAD_STACK_MIN as thread stack size on FreeBSD.
	PTHREAD_STACK_MIN must be huge on Linux for all this code to work. On
	FreeBSD the code will generally hit the end of the stack before the
	third function call.

New 1d setpoint generator for simple control
Added test blocks
Added tests for some blocks
Removed broken iir_test

Fix block dependencies

Also fixes setting of interval and name by j2000 tracker. (was a bug in
select loop of trace_proxy)

trace_proxy now supports INTERVAL_TYPE_CHANGED clients and clients with a bigger interval than the source.

Some optimizations and some bugfixes and less leaking

Timestamps are still wrong

Ported trace_list to new protocol and interface
Started port of trace_dump

A few improvements from the Vitsch Electronics CVS
Use log_send() for all logging and add context (DEBUG/WARNING/ERROR) info.
A little bit more comments