Make all harness/* file names consistent; update occurrences in test

harness/dateConstants.js

harness/tcoHelper.js

test/built-ins/Date/S15.9.3.2_A1_T1.js

test/built-ins/Date/S15.9.3.2_A2_T1.js

test/built-ins/Date/S15.9.3.2_A3_T1.1.js

test/built-ins/Date/S15.9.3.2_A3_T1.2.js

test/built-ins/Promise/all/S25.4.4.1_A2.2_T1.js

test/built-ins/Promise/all/S25.4.4.1_A7.2_T1.js

test/built-ins/Promise/all/S25.4.4.1_A8.1_T1.js

test/built-ins/Promise/all/S25.4.4.1_A8.2_T1.js

test/built-ins/Promise/all/S25.4.4.1_A8.2_T2.js

test/built-ins/Promise/prototype/then/S25.4.4_A1.1_T1.js

test/built-ins/Promise/prototype/then/S25.4.4_A2.1_T1.js

test/built-ins/Promise/prototype/then/S25.4.4_A2.1_T2.js

test/built-ins/Promise/prototype/then/S25.4.4_A2.1_T3.js

test/built-ins/Promise/prototype/then/S25.4.5.3_A5.1_T1.js

test/built-ins/Promise/prototype/then/S25.4.5.3_A5.2_T1.js

test/built-ins/Promise/prototype/then/S25.4.5.3_A5.3_T1.js

test/built-ins/Promise/race/S25.4.4.3_A6.1_T1.js

test/built-ins/Promise/race/S25.4.4.3_A6.2_T1.js