Set working directory to value of "mcv.userpath".

[1327]
Local override of GridUtil. [1327]

There is being done to satisfy the default path stuff from Inquiry
1327. I may also fix the deprecation warnings prior to submitting a
pull request.
Fix default path bug. [1327]

This modifies “exportGridToNetcdf” and “writeGridToXls” to use the
“user.dir”/“mcv.userpath” System property (if the user has not
specified the exact path).