when env script is not passed, test environment for compilers CC and CXX and FC.
if not found, complain that no env is passed and compilers were not found

I think we should use the https url's when we git clone to avoid any proxy or permission issues. This applies to the third party library setup.

Currently we need an env variable named MPIRUNe. Change the name

wget: support case where user does not have this.
Either I clone it as a tpl and enable it, or I detect the env for another command.

Color-code prints for clarity

Currently, the build system accepts a path to directory where to build and install things.
This is not ideal, because the name of this target can be anything.
Proposed change: pressio-builder creates the target folder using proper naming convention.
Just ask user to give the path to where they want to put things, and we create the target folder with a proper naming using compiler info, etc.
For example, something like: machinename_pressio_dbg/release_compilername_version_...

We assume env is set. This means what?
Need a function to check that:
CC is defined
CXX is defined
etc

Enable users to provide custom bash function as command line argument.
Basically, the repo holds default settings.
Users should pass a bash script that contains possible functions to assemble the cmake string to call to configure.
This bash script is sourced by pressio-builder and the target function is called.

Fix script to build website to make sure code snippets are reverted if an error is thrown