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- break long lines
- use common format for error messages

- scanning for groups and computation of their depth re-implemented

- "typeset -p" is able to handle multiple variables!

- this environment variable was used in the past in modulefiles to load
  the required Tcl code for Pmodules

- in sub-command 'load': print conflict message not just load failed
- in sub-command 'search': equal sign can now be used for options
  '--with' and '--release'
- sub-command options can now be specified on the LHS of the sub-command

- sub-command 'swap' is now implemented via unload/load
- tmpfile variable in subcommand_load() cannot be read-only any more

Not all cached data has been updated while unloading a module amangst
other the list of used groups (UsedGroups)

- prepend Pmodules bin directory to PATH
- export MANPATH

- libmodules.tcl: rename implementation to variant, fixes in file name joining
- modulecmd.bash.in: get available groups from 'GroupDepths'. There is no
  need to use a dedicated variable for housekeeping available groups.

- PMODULES_USED_GROUPS renamed to UsedGroups, now saved to PMODULES_ENV
- fixes in exporting variables

- 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

- fix issue with "puts stderr "foo bar" in modulefiles
- comment to subcommand_unload() edited

- bug fixed in testing availability of module.
- bug fieed in loading dependencies: we must echo the output of the load
  command!

- bugfix in subcommand_load(): modules may write something to stderr while loading.

- support for use-flags implemented/fixed

- support for architecture specific modules added
- cleanup

- in subcommand_search(): option to print variants file style output removed

- bugfix in subcommand_load(): LOADEDMODULES were not set correct: the output of "modulecmd ...

- bugfixes in subcommand_load()

Pmodules/modulecmd.bash.in: subcommand_load(): load modules with absolut path; use 'module show' to test availability and to get absolut module file name and module PREFIX; adapt to changed 'get_options()'; use 'std::upvar()' where reasonable

- bugfix in use(): export MODULEPATH

- subcommand_use(): export MODULEPATH if adding a group, closes #25

- get_available_modules2(): return immediately if directory does not exist