Review configuration files location

[algorys]

If we want in future install App as a root user (as in #222), configuration files place should be reviewed for Linux. Not only in $HOME/alignak_app folder but also in /usr/local/alignak_app for Debian like and adding other folder for other distributions.

The app_workdir should be also review maybe with an environment variable, called "APPWORKDIR" in every system.

CSS and images should also follow the same changes to ensure that all files are located inside app_workdir.

[algorys]

Configuration files can now be located in different directories. But environment variables need to be reviewed.

• APPWORKDIR -> ALIGNAKAPP_DIR : rename variable
• Review app_dir creation in Settings() class
• Variables needs to be found faster when starting App
• Create a variable for logs: ALIGNAKAPP_LOG
• Bash script should be copied in user bin to start App in case install have been done by root user.

Maybe we can locate the bin/alignak_app.py to get app_dir value ?

• See also start under Windows to see how app can manage variables

[algorys]

Done.