Error port for added fault tolerance

[dmichiels]

Mainly fix #22

Failure handling

Basic with component

All the errors raised by the port and independent procedures are catch. They are send to the default 'ERROR' simple output port the following record : port_procedure(name:Name type:Type error:E entryPoint:EntryPoint) The label changes to independent_procedure if the error is raised inside an independent procedure. The name is the name of the component, the type is the type. error E is the error that crash the execution. entryPoint EntryPoint is the entryPoint of the component. You can do {EntryPoint stop} for example.

sub-component

When a sub-component is created, all the 'ERROR' port of the the inside component are automatically binded to the virtual port 'ERROR'. So it's possible to catch all the errors from an sub-component.

Makefile

The make file use now the OZHOME variable

Little change in component.oz

entryPoint

The component record know its own entryPoint.

run

The component had a feature "run". When it's false, the component doesn't execute itself. It put at true when the component receive "start" and at false when the component receive "stop". The start/exec message are merged and simplified.

TestSub

The basic launcher testSub.ozf show all errors in the console. If the same component throw 5 times an error, the component is stopped.

Test

The test has be done with the wrong version of loadBalancer. It seems to work well!

[sjmackenzie]

excellent

[sjmackenzie]

Don't think component/failure was committed to the repo.

%********************** Error: module manager *******************
%**
%** Could not link module
%**
%** Could not load functor at URL: ./components/failure/five.ozf
%**--------------------------------------------------------------