Merge Request #12 - July

Features

• Java: add Future.getError
• Java: forward exceptions’ getMessage to caller
• qi::File: add unicode file path support

Bugfixes

• Fix some compilation warnings
• SDKLayout: disable copy
• Object.setProperty: fix deadlock and runtime warning on some mangled use-case of setProperty over the network
• Application: fix race condition on stop
• Signal: fix compilation errors on connection of actors with arguments
• SDKLayout: read new environment variable QI_ADDITIONNAL_SDK_PREFIXES
• SignalSpy: add waitUntil
• Fix various opertor= to handle self-assignation
• Python: fill-in argv[0] with a default value if empty (when started from REPL)