Added Pig scripts for testing

pig_scripts/testing/test_basic_functions.pig

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+-- load a single system table from a dataset
+sys = load 'datasets="mocca 14bd768a5357ab95df307e58a70657ba" tables="system"' using BeansTable();
+-- generate some example columns
+sys = foreach sys generate rchut2, smt;
+-- basic filtering
+sys = filter sys by smt > 0.0;
+-- store into a table
+store sys into 'name="test_load_filter_store"' using BeansTable();

pig_scripts/testing/test_generate_for_join.pig

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+-- load system table from a single dataset
+sys = load 'datasets="mocca 01f4f7bfadd9ee5ab2568d73ee7b9dda" tables="system"' using BeansTable();
+-- generate only the needed columns for this test
+sys = foreach sys generate DSID(tbid) as dsid,
+							DSPARAMSTRING(DSID(tbid), 'moccaid') as moccaid,
+                            tphys;
+-- store the data
+store sys into 'name="test_data_for_join_01f4f7bfadd9ee5ab2568d73ee7b9dda"' using BeansTable();

pig_scripts/testing/test_join_collapse.pig

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+-- load the previously generated data
+sys = load 'datasets="Testing Notebook" tables="test_data_for_join_01f4f7bfadd9ee5ab2568d73ee7b9dda"' using BeansTable();
+-- load the collapse information table
+collapse = load 'datasets="core collapse and blue stragglers" tables="collapseMyr_vs_bssdynBssEvol"' using BeansTable();
+-- join sys and collapse by sys::moccaid == collapse::dsid
+j = join sys by moccaid, collapse by dsid;
+-- generate the columns and add a collapse column (1 - collapsed, 0 - not collapsed)
+j = foreach j generate sys::tbid 	as tbid,
+						sys::dsid 	as dsid,
+                        sys::moccaid	as moccaid,
+                        sys::tphys	as tphys,
+                        collapse::collapseMyr 	as collapseMyr,
+                        collapse::confidence	as confidence,
+                        (sys::tphys < collapse::collapseMyr ? 0 : 1) as collapsed:int
+                        ;
+-- store the joined table
+store j into 'name="test_01f4f7bfadd9ee5ab2568d73ee7b9dda_with_collapse"' using BeansTable();

pig_scripts/testing/test_load_by_name.pig

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+-- load a table that was previously saved
+sys = load 'datasets="Testing Notebook" tables="test_load_filter_store"' using BeansTable();
+-- store the loaded table to check if it lads correctly
+store sys into 'name="TEST_LOAD_BY_NAME_FROM_NOTEBOOK"' using BeansTable();