Make use of autoinit module command to initialize module command and its
initial surrounding environment (default value for MODULESHOME,
MODULEPATH, LOADEDMODULES and parse of init/.modulespath).
Then if compatibility version is currently activated redefined the
module command to point to the compat binary. But the compat version
will benefit from the surrounding environment initialization made by
autoinit.
With this change, activated compatibility version will also get its
environment initialized by the init/modulerc file whereas before this
change only the main version was affected by this setup file.
Introduce MODULE_USE_COMPAT_VERSION environment variable to control the
activation of the compatibility version rather main version in case of
--enable-compat-version installation.
The initialization script of the shells supporting compatibility version
are adapted to define the 'module' command based on the modulecmd-compat
binary if MODULE_USE_COMPAT_VERSION is set to 1. Elsewhere module is
based on modulecmd.tcl.
'switchml' function of alias is reintroduced to switch between main and
compatibility version based on the state of the
MODULE_USE_COMPAT_VERSION environment variable.
Acknowledgment: this development has been made and funded within the
framework of the PRACE Fifth Implementation Phase (PRACE-5IP) project
(http://www.prace-ri.eu/). PRACE-5IP receives funding from the EU's
Horizon 2020 research and innovation programme (2014-2020) under grant
agreement no. 730913.
