Management of unicode by the whole code and mechanism for different help messages.

Supports: 
- unicode username
- unicode command names (symbolic link to the command, ...)
- unicode directories and paths for file db
- unicode .rs files (name and content)
- unicode depsfinder and guesser name
- rules graph with unicode name and content
- dependency graphs with unicode name and content (XML and DOT)
- action graphs with unicode name and content (XML and DOT)

--

A new option can be written in the config file in order to change the actions allowed to the sequencer or to a symbolic link towards the sequencer. Different commands will have different help messages and depending on the value of this option.

...
[normalset]
allowed=dbcreate, dbadd
...