update floating point comparison tests

[atomczak]

removed attribute and property tests using fixed 1e6 tolerance, replaced with relative precision (according to #294 and #78)

[atomczak]

For easier checking, here is the list of tests that were added:

value == 100000
	fail 99999.8999989
	pass 99999.899999
	pass 100000.100001
	fail 100000.1000011	

value == 1
	fail 0.9999979
	pass 0.999998
	pass 1.000002
	fail 1.0000021

value == 0.0000001
	fail -0.00000090000011
	pass -0.0000009000001
	pass 0.0000011000001
	fail 0.00000110000011

value == 0
	fail -0.0000011
	pass -0.000001
	pass 0.000001
	fail 0.0000011

value == -0.0000001
	fail -0.00000110000011
	pass -0.0000011000001
	pass 0.0000009000001
	fail 0.00000090000011

value == -1.0
	fail -1.00000200001
	pass -1.0000020000
	pass -0.999998
	fail -0.9999979

value == -1000000.0
	fail -1000001.00000100001
	pass -1000001.0000010000
	pass -999998.999999
	fail -999998.9999989

value > 0
	fail 0.0000009
	pass 0.000001

value >= 0
	fail -0.0000011
	pass -0.000001

value < 0
	fail -0.0000009
	pass -0.000001

value <= 0
	fail 0.0000011
	pass 0.000001

All 36 tests are based on Property, none on Attribute facet. I thought it's unnecessary to duplicate, but if you think we need both, I can add another 36 tests just on Attributes.