Add ZIM format support (issue #267). Now turned on by default for Windows only. Under Linux/MacOS use "qmake "CONFIG+=zim_support"" (liblzma-dev package required. Or take xz 5.0.5 sources from http://tukaani.org/xz/ and compile it).
Zim: Add liblzma.a and it headers for MacOS, turn on Zim support under MacOS by default.
Some more unhandled exceptions in index search
Zim: Split files support
Merge branch 'zim-support'
Some more exception handling
Possibility to log GD console messages into file "gd_log.txt" in GD config directory. Activated by "--log-to-file" key in command line.
Don't treat folders with recognized dictionary extensions as dictionaries

For example, it makes no sense trying to initialize Test.dsl folder
as DSL dictionary.