Merge pull request #803 from pigrew/usbtmc_default_rm

USBTMC: remove reference to visa DLL (which only was for windows, and…

examples/device/usbtmc/visaQuery.py

@@ -143,7 +143,7 @@ def test_stall_ep0():
 	assert (inst.read_stb() == 0)
 
 
-rm = visa.ResourceManager("/c/Windows/system32/visa64.dll")
+rm = visa.ResourceManager()
 reslist = rm.list_resources("USB?::?*::INSTR")
 print(reslist)