Revert "macroprocessor: interpret arrays passed on the command line as arrays instead of strings. closes #1578"

Commit 204d9cd05fef9ac6fda8530536578c05fab66366 fails with gcc 4.9 (I checked that it works flawlessly
with 6.x). The error message is:

MacroDriver.cc:63:24: error: 'class std::basic_string<char>' has no member named 'front'
         if (it->second.front() == '[' && it->second.back() == ']')
                        ^
MacroDriver.cc:63:53: error: 'class std::basic_string<char>' has no member named 'back'
         if (it->second.front() == '[' && it->second.back() == ']')

Ideally we should bump the version of gcc used in the build system, but I will not do that before the
next bug fix release. I suppose it is easier to replace the front() and back() methods.

macroprocessor: interpret arrays passed on the command line as arrays instead of strings. closes #1578

preprocessor: add line number to field in structure that macro variables are saved to. #1564

Correct setting of plot_shock_decomp.type

Closes #1548

 - Switched to master branch with new OOP interface.
 - Removed initialization of empty dseries and dates objects (preprocessor).

Add preprocessor options for GMM, SMM, IRFs

preprocessor: histval lag check must be made after transformation to the dynamic model due to ramsey_policy. closes #1193