Stream stdout and stderr from subprocess processes.

[Javier Cózar del Olmo]

Right now the subprocess run a shell process and return the stdout and stderr at the end of the execution.

It is useful to stream such information in real time.

[Jacinto Arias]

We should also indicate the current project like:

-------------------------
Entering projectA

Running stage xxx:
STDOUT:
   <stdout>
STDERR:
   <stderr>
-------------------------

[Jacinto Arias]

It would be nice to have an additional parameter to run silently and to print the output to a searchable log. (at least one file for stdout and stderr)

By searchable I mean: Create unique index to identify the section of each project log i.e:

Log-Proj-x

[Javier Cózar del Olmo]

I agree. Indeed, we should use the package logging, and use standard log levels, handlers (stdout or files), etc.