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 tuning for MinGW 4.8 build
Handle some unhandled exceptions in index search
Fixed compilation failure
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.