- Pmodules/bash: contains now only the 'module()' function, some sanity
  checks and initialization of bash completion plus unsetting some unused
  variables.
- Pmodules/libstd.bash: bug fixed in std::append_path if path includes spaces
- Pmodules/modulecmd.bash.in: (re-)initialize if 'PMODULES_ENV' is empty or
  unset