Some code and comment cleanup

- Remove all references to split points
- Some grammar and spelling fixes

No Functional change

Resolves #478

src/thread.cpp

@@ -33,8 +33,8 @@ extern void check_time();
 
 namespace {
 
- // Helpers to launch a thread after creation and joining before delete. Must be
- // outside Thread c'tor and d'tor because the object must be fully initialized
+ // Helpers to launch a thread after creation and joining before delete. Outside the
+ // Thread constructor and destructor because the object must be fully initialized
  // when start_routine (and hence virtual idle_loop) is called and when joining.
 
  template<typename T> T* new_thread() {
@@ -83,8 +83,8 @@ void ThreadBase::wait_while(std::atomic<bool>& condition) {
 }
 
 
-// Thread c'tor makes some init but does not launch any execution thread that
-// will be started only when c'tor returns.
+// Thread constructor makes some init but does not launch any execution thread, 
+// which will be started only when the constructor returns.
 
 Thread::Thread() {
 
@@ -170,9 +170,9 @@ void MainThread::join() {
 
 
 // ThreadPool::init() is called at startup to create and launch requested threads,
-// that will go immediately to sleep. We cannot use a c'tor because Threads is a
-// static object and we need a fully initialized engine at this point due to
-// allocation of Endgames in Thread c'tor.
+// that will go immediately to sleep. We cannot use a constructor because Threads 
+// is a static object and we need a fully initialized engine at this point due to
+// allocation of Endgames in the Thread constructor.
 
 void ThreadPool::init() {
 
@@ -183,7 +183,7 @@ void ThreadPool::init() {
 
 
 // ThreadPool::exit() terminates the threads before the program exits. Cannot be
-// done in d'tor because threads must be terminated before freeing us.
+// done in destructor because threads must be terminated before freeing us.
 
 void ThreadPool::exit() {