Initval histval file

Refactoring initval_file and histval_file

added 2 commits

• 86e48e11 - Block decomposition: replace expr_t by BinaryOpNode * in a couple of places
• f7fa1813 - Block decomposition: bugfix, cutoff option was ignored

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added 91 commits

• f7fa1813...ba214a10 - 90 commits from branch Dynare:master
• 16eb4bb6 - Merge branch 'master' into 'initval_histval_file'

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closed