Use TestExpress feature in all tests

[byrnHDF]

Currently, these tests use the test scale 0-3 where 0 is most extensive and 3 the minimal. TestExpress default is 3.

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test/btree2.c: ExpressMode = GetTestExpress();

test/cache.c: express_test = GetTestExpress();

test/cache_api.c: express_test = GetTestExpress();

test/cache_image.c: express_test = GetTestExpress();

test/earray.c: ExpressMode = GetTestExpress();

test/farray.c: ExpressMode = GetTestExpress();

test/fheap.c: ExpressMode = GetTestExpress();

test/h5test.h:H5TEST_DLL int GetTestExpress(void);

test/objcopy.c: ExpressMode = GetTestExpress();

test/objcopy_ref.c: ExpressMode = GetTestExpress();

test/tsohm.c: if (GetTestExpress() > 1)

test/tsohm.c: if (GetTestExpress() > 1)

test/testframe.c:GetTestExpress(void)

testpar/t_2Gio.c: express_test = GetTestExpress();

testpar/t_shapesame.c: local_express_test = GetTestExpress();

testpar/t_shapesame.c: local_express_test = GetTestExpress();

testpar/t_shapesame.c: printf(" express_test = %d.\n", GetTestExpress());

testpar/t_filters_parallel.c: test_express_level_g = GetTestExpress();

testpar/t_cache.c: * by GetTestExpress() across all processes. Return this

testpar/t_cache.c: * GetTestExpress() across all processes.

testpar/t_cache.c: express_test = GetTestExpress();

[byrnHDF]

Almost every test treats it as a boolean - usually 0 == 1 is ON and val > 1 is OFF

Also almost every test has it as a local variable in the main function, and a couple may pass it into test functions.

[derobins]

The testing framework has been fixed, but we'll need people to go through and decide appropriate levels.