system modulefile command is intended to the command passed to it trough
shell, like done on compatibility version.
So update system procedure to find correct shell on the current platform
and run command through it.
Doing so, shell commands with backticks for instance are correctly run.
Fixes#205
Correctly transmit the arguments along with the command to execute. Need
to use 'eval' for the underlying command to get its multiple args and
not one joined string.
Fixes#201
fly, as it were. It's a powerful mechanism for dynamically changing
environment variables, aliases, X11 resources, etc.
It uses an embedded Tcl intrepretor, with a few extensions. Therefore,
it has a well defined language syntax.
Version 3.1 is GPL, and includes many improvements over the 3.0beta.
