Rename loop counter in BcTypes
The compiler warning about the inner loop counter shadowing the outer one doesn't appear reliably, but as a matter of good practice, we should just rename it since no readability is lost.
ippl/src/Field/BcTypes.hpp(312): warning: reference is to variable "i"
(285): here -- under old for-init scoping rules it would have been variable "i"
(298): here
Edited by vinciguerra_a