Merge pull request #156 from peter-kolenic/master

typo
webgis: fixed legend items order and duplicit FORMAT parameter in GetLegendGraphic requests (closes #93, closes #116)
webgis: excluding WMS URL info from properties for quest user
install aws: adding 'GISLAB_UNIQUE_ID' to instance tag.
install: rewrited script for support server installation or upgrade
client: updating tooltip to 'GIS.lab > GIS project creation ...' application launcher.
install: do not restore 'repository' share with data on upgrade.
install, admin scripts: use XDG variables for accessing well known directories in HOME
install: updating shared directories permissions.
Merge branch 'master' of github.com:imincik/gis-lab
install: moving creation of default server web page to separate install script.
Adding possibility to boot client from HTTP using iPXE image.
install: moving IRC server to 'chat.gis.lab' DNS.
install: hold VirtualBox packages on server to avoid modules upgrade (and server restart).
Documentation update in config.cfg
webgis: fixed bug in encoding BASE and OVERLAY parameters
webgis: refactoring of project configuration loading (closes #157)
config: removing configuration variable GISLAB_DNS_SERVERS
install: allow HTTP boot from 'http://boot.gis.lab' and also from http://.5
webgis: removed the need of .qgs extension from project name