Make year output row-major (right then down)

The prior version went

    Jan  May  Sep
    Feb  Jun  Oct
    Mar  Jul  Nov
    Apr  Aug  Dec

Now it displays

    Jan  Feb  Mar
    Apr  May  Jun
    Jul  Aug  Sep
    Oct  Nov  Dec

Roughly, top-to-bottom as winter, spring, summer, autumn.

I've parameterized this so it can go either way, currently hard-coded to
row major. This leaves open a future option to make this a command
switch.

Resolves #8

Update README

CHANGELOG.md

@@ -1,6 +1,13 @@
 Change Log -- calendar
 ====================================================================================================
 
+# v2.0.0  (2024-02-05)
+
+### Change
+  - Made the annual calendar print row major. That is, months go left-to-right, then top-to-bottom.
+
+
+----------------------------------------------------------------------------------------------------
 # v1.2.0  (2023-12-01)
 
 ### Fix

README.md

@@ -24,7 +24,7 @@ Usage
     The `--startSun` option sets first day of the week as Sunday. By default, Monday
     is considered the first day of the week.
 
-    calendar 1.2.0 | 2023-12-01 | https://github.com/hollasch/calendar
+    calendar 2.0.0 | 2024-02-05 | https://github.com/hollasch/calendar
 
 
 Building

calendar.cpp

@@ -18,7 +18,7 @@
 using std::cout, std::cerr;
 
 
-const char* version = "calendar 1.2.0 | 2023-12-01 | https://github.com/hollasch/calendar";
+const char* version = "calendar 2.0.0 | 2024-02-05 | https://github.com/hollasch/calendar";
 
 //--------------------------------------------------------------------------------------------------
 
@@ -190,7 +190,12 @@ void printYear (const ProgramParameters& params) {
 
     // Print four rows of three month columns.
 
-    for (int leftMonth=0;  leftMonth < 4;  ++leftMonth) {
+    const bool rowMajor = true;  // Months go (true=left-to-right, false=top-to-bottom) first.
+    const int  lastRowStart = rowMajor ? 9 : 3;
+    const int  rowStep      = rowMajor ? 3 : 1;
+    const int  colStep      = rowMajor ? 1 : 4;
+
+    for (int leftMonth=0;  leftMonth <= lastRowStart;  leftMonth += rowStep) {
 
         cout << "\n    "   << params.dowHeader   // Print day-of-week headers
              << "        " << params.dowHeader
@@ -204,7 +209,7 @@ void printYear (const ProgramParameters& params) {
         // Initialize start and last days for each month column.
 
         for (int column = 0;  column < 3;  ++column) {
-            int month = leftMonth + 4*column;
+            int month = leftMonth + colStep*column;
             day[column] = monthWeekStartDay(params.startSun, monthDayOneDOW(params.year, month)),
             lastDay[column] = monthNumDays(params.year, month);
         }
@@ -214,7 +219,7 @@ void printYear (const ProgramParameters& params) {
         while (day[0] <= lastDay[0] || day[1] <= lastDay[1] || day[2] <= lastDay[2]) {
             cout << '\n';
             for (int column = 0;  column < 3;  ++column) {
-                int month = leftMonth + 4*column;
+                int month = leftMonth + colStep*column;
 
                 if (0 < column)
                     cout << "    ";