feat(opatIO_sandbox): added opatIO sandbox for freeform testing

tests/meson.build

@@ -16,4 +16,5 @@ subdir('network')
 
 # Subdirectories for sandbox tests
 subdir('dobj_sandbox')
+subdir('opatIO_sandbox')
 

tests/opatIO_sandbox/meson.build

@@ -0,0 +1 @@
+executable('tryGS98', 'opacity.cpp', dependencies: [opatio_dep])

tests/opatIO_sandbox/opacity.cpp

@@ -0,0 +1,28 @@
+#include <vector>
+#include <iostream>
+//#include <string>
+#include "opatIO.h"
+
+
+int main() {
+
+    std::string FILENAME = "GS98hz.opat";
+    OpatIO opatIO(FILENAME);
+    Header header = opatIO.getHeader();
+    std::cout << header.version << std::endl;
+    std::cout << header.comment << std::endl;  
+    std::cout << header.numTables << std::endl;
+
+    std::vector<TableIndex> tableIndex = opatIO.getTableIndex();
+
+    //print out the X,Z pairs in the table
+    for (size_t i=0; i< tableIndex.size()-1; i++){
+	std::cout << "Table [" << i << "]: {" << tableIndex[i].index.at(0) << ", "
+		  << tableIndex[i].index.at(1) << "}" << std::endl;
+    }
+
+    //find the table index corresponding to X=0.1, Z=0.001
+    std::vector<double> index = {0.1, 0.001};
+    OPATTable tab =  opatIO.getTable(index);
+
+}