GUI: support for setting preferred unix group name
Merge pull request #491 from zlamalp/prefGroup

GUI: support for setting preferred unix group name
GUI: refactored and optimized gwt modules

- Based on knowledge from WUI project, gwt now uses inheritance:

- standard "mvn clean install" builds devel version of gui without sourcesMaps
  => speed up compile
- "mvn clean install -Pproduction" builds production version of gui without sourcesMaps
  but fo all browsers. Now uses xsiframe linker.
- for local development pick "-dev" modules, they build also sources map, but support only
  two browsers.

- Moved .gwt.xml files to ensure visibility to gwt compiler.
Merge pull request #492 from zlamalp/guigwt

GUI: refactored and optimized gwt modules
U:D:login-namespace - allow login tomcat

Login 'tomcat' was forbidden because it can collide with unix system
user tomcat. Actually system user's name is tomcat6 or tomcat7.

Conclusion:
login tomcat is allowed
logins tomcat[678] are forbidden
Fix objects in exception in defaultUnixGidModule

 - add also facility to this exception
Merge pull request #494 from stavamichal/addAllBeansToExceptionsInDefaultUnixGidModule

Fix objects in exception in defaultUnixGidModule
GUI: Display notice when browser is unsupported.

- Check by supported features if browser is unsupported (IE < 8)
  and if so, display alert notice.
Merge pull request #495 from zlamalp/unsupported

GUI: Display notice when browser is unsupported.
Fix SQL query in method getVoExtSources

 - oracle do not use "as" in sql query
 - postgras do not need "as" in sql query
Merge pull request #496 from stavamichal/fixSQLQueryForMethodGetVoExtSources

Fix SQL query in method getVoExtSources
make engine ignore facilities alcor,aldor,ascor.ics.muni.cz (for testing of new engine)