Work in progress towards a re-write of splitStringWithEncs.

I've already re-worked the algorithm (to suit Excel-generated CSV),
now I want to get it into a templated form.
Fix templated splitStringWithEncs.

Thew problem was with the additional type charType - if I wanted a
default value for that argument, then the compiler couldn't work out
what type that should be.

Solution was to use the string member value_type which is char for a
string and presumably Glib::unichar for a Glib::ustring.
Adds a Glib::ustring test in testSplitString.cpp
Comment out DBGs as they're not safe as they are.
Merge branch 'splitstring_excel_compatibility'