Added exceptions in write_vtk() method (and some text in the user guide) to clarify that when exporting flows to VTK, t2grid must be specified and the block names in geometry and listing must match
Substituted comparisons '<>None' with 'is not None'
Rewrote fix_blockname() function for increased speed
Rewrote unfix_blockname() function
Added reduce() method, for reducing geometry to a specified list of columns
New fixed_format_file class, created by factoring out the general parts of the old t2data_parser class
Added fixed_format_file to list of modules in setup.py
Allowed user-specified conversion functions in fixed_format_file class; expanded docstring
Using new fixed_format_file class to read mulgrids: implemented for reading nodes
Use fixed_format_file class to read header; also corrected an error in fixed_format_file docstring
Use fixed_format_file class to write header and nodes
Use fixed_format_file class to read and write columns
Added t2data support for reading AUTOUGH2 extra precision auxiliary data files
Added t2data support for writing AUTOUGH2 extra precision auxiliary data files
Documentation update for AUTOUGH2 extra-precision data file support in t2data
Fixed typo in user guide for t2data write() method
Use fixed_format_file class to read and write connections; fixed bugs in read_nodes() and read_columns()
Use fixed_format_file class to read and write layers
Use fixed_format_file class to read and write surface
Use fixed_format_file class to read and write wells