Apply clang-tidy automated code changes

Enabled checks:
    boost-use-to-string
    misc-uniqueptr-reset-release
    modernize-deprecated-headers
    modernize-make-shared
    modernize-use-bool-literals
    modernize-use-equals-delete
    modernize-use-nullptr
    modernize-use-override
    performance-unnecessary-copy-initialization
    readability-container-size-empty
    readability-redundant-string-cstr
    readability-static-definition-in-anonymous-namespace
    readability-uniqueptr-delete-release

GeneratorInterface/RivetInterface/src/CMS_2013_I1224539_DIJET.cc

@@ -30,7 +30,7 @@ namespace Rivet {
     //@{
 
     /// Book histograms and initialise projections before the run
-    void init() {
+    void init() override {
       FinalState fs((Cuts::etaIn(-2.4, 2.4)));
       declare(fs, "FS");
 
@@ -60,7 +60,7 @@ namespace Rivet {
     }
 
     /// Perform the per-event analysis
-    void analyze(const Event& event) {
+    void analyze(const Event& event) override {
       const double weight = 1.0;
 
       // Look at events with >= 2 jets
@@ -94,7 +94,7 @@ namespace Rivet {
     }
 
     /// Normalise histograms etc., after the run
-    void finalize() {
+    void finalize() override {
       const double normalizationVal = 1000;
       for (size_t i = 0; i < N_PT_BINS_dj; ++i) {
         normalize(_h_ungroomedAvgJetMass_dj[i], normalizationVal);