Also fix the wrong behavior of estimate_duration on new calls

This made them fail when data was being written on standard outputs

Any host command (other than pause) will now be run as a pronsole
command. This will allow doing things such as #428 easily.

These 2100 lines of code were really a huge mess ><
Also rename some functions.

Better name will ease understanding the code :)

Heavily untested except on Arch Linux.