zotero_cgi.cc: Use implicit conversion of unsigned to std::string
zotero_cgi.cc: Use implicit conversion of unsigned to std::string

ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools