Fix file format readers in VarDriver.cpp have been commented out

[johnmauff]

Historically Samurai has supported a significant number (26) of different file formats. The current optimized and portable version of Samurai has commented a number of these out. For example, see the VarDriver::read_wwind method in the VarDriver.cpp file. We need to both improve the error check such that Samurai fails if it encounters one of the commented out file format, and we need to port the commented out file format readers to the C++11 standard string manipulation functions

[cenamiller]

Kamino cloned this issue to NCAR/samurai-dev