improve wording of help strings and outputs

See merge request mpsd-cs/mpsd-software-environments!55

amongst other things explain why 'available' is called 'available'

fixes bug !49

See merge request mpsd-cs/mpsd-software-environments!54

Can easily re-add when the feature comes. The argument is not used in the
function yet at all. It is not even clear this is the right place to clear the
environment before we call 'install' again.

(Function takes one argument less now after
https://gitlab.gwdg.de/mpsd-cs/mpsd-software-environments/-/merge_requests/49)

neither `start-new` nor `remove` should be exposed to user at the moment

See merge request mpsd-cs/mpsd-software-environments!50

fix issue #9

Closes #9

See merge request mpsd-cs/mpsd-software-environments!52

# Conflicts:
#   mpsd-software.py

If toolchain cannot be found, point to `available` command.

See merge request mpsd-cs/mpsd-software-environments!51

reinstallation functionality missing - let's hide it from the users

See merge request mpsd-cs/mpsd-software-environments!49

(https://gitlab.gwdg.de/mpsd-cs/mpsd-software-environments/-/issues/9)

as they do not work; their existence will only cause confusion

prepare: update spack-environments repo if it exists already

See merge request mpsd-cs/mpsd-software-environments!48

Status command : add module commands for each microarch

See merge request mpsd-cs/mpsd-software-environments!46

Provide --version functionality

See merge request mpsd-cs/mpsd-software-environments!44

Make tool name shorter

See merge request mpsd-cs/mpsd-software-environments!47

addresses issue 10 (
https://gitlab.gwdg.de/mpsd-cs/mpsd-software-environments/-/issues/10)

Not sure how this could get here.

and remove unused mod_use object

Improve available output

See merge request mpsd-cs/mpsd-software-environments!45

change name of log file (shorter, relates to command name)

See merge request mpsd-cs/mpsd-software-environments!43

Status command

See merge request mpsd-cs/mpsd-software-environments!41

# Conflicts:
#   mpsd-software-environment.py