v2.7

This version introduces a new format for input options, type:name[value], which can be used for global options, histos, and sets. Histos/plots and sets now have a separate set of local options used to store member variables and other object-specific settings. The broad use of this new option format significantly improves the flexibility of the code and streamlines the parsing of input files. The input files themselves contain slightly more text, but gain in readability and adaptability.