patched L::L::DBIxSimple to handle omiholders and placeholders in same query; new dbix-simple.t to test it; moved loop queries to data-maps in activity_data.pl; replace pipe-delimited file with xl file in gallium data for quintiles

print report function calculates composite immunohistochemistry p21/p53 result; replaced M::Request::get_previous_diagnosis_count() with get_previous_diagnoses() to supply data instead of just count, replacing redundant previous_diagnosis_data from C::Report::load(); printed reports now display 'amended report' details and highlights changed diagnosis; QueryLog creates separate logfiles for dev server user, to avoid lack of write permissions if files opened by Apache user & also to avoid polluting production logs with dev data