Revert "removing tests of conditional forecast that are blocking the test suite"

This reverts commit 8be13512d0267b925c2a2e66a8458987f69fd3db.
Temporarily disable conditional_forecast tests
Adapt for removal of luinc in MATLAB R2013a
Temporarily disable another test which goes into an infinite loop
Fix .gitgnore w.r.t. matlab/missing
Adapt for change of ismember in MATLAB R2013a
Revert spurious preprocessor changes introduced in dfa744f
Automatic detrending engine can now handle models written in logs (ref. #309)

 - new command `log_trend_var'
 - new option `log_deflator' to `var' command
Also ignore TeX files produced with options_.TeX = 1
Use syntax log_trend_var(log_growth_factor = …) for consistency
Conditional forecast test: remove spurious changes introduced in dfa744fcb3

As a consequence, reactivate the tests
Mention compatibility with Windows 8
Fix Typo in correlation_mc_analysis
Bugfix in correlation_mc_analysis

Closes #290 and makes #314 obsolete as we store both auto- and
cross-correlations
Merge branch 'master' of https://github.com/DynareTeam/dynare
Merge pull request #343 from JohannesPfeifer/master

Bugfixes of correlation_mc_analysis