Replaced QAMoveTo, QASelect and QAShiftSelect draw commands with vmoveto and vselect
Moved vselect and vmoveto draw commands to ViewerTest_ViewerCommands.cxx
Replaced QAMoveTo and QASelect in test cases. Corrected returned error case result in vselect and vmoveto.
Added commands in ViewerTest_ViewerCommands from QADraw. Edited tests.
QACommands in tests were replaced with ViewerTest commands.
QAxwd command was removed from QADraw. Edited command wzoom and commands from ViewerTest.
Help for ViewerTest commands was edited
Small corrections. Added test cases for polygonal selection.
Small correction of test cases
Adding procedures checkcolor and checkpoint.
Modified test cases which are used QAGetPixelColor or QAAISGetPixelColor2d
Allow using command QAAISGetPixelColor2d on WNT
Rename test case tests/bugs/vis/bug19619 to pro19619
Added test cases to modalg and moddata
When test is run interactively, imagedir is set to temporary directory (search order: environment variables TempDir, Temp, Tmp, upper and lower case, in this order, then $HOME/tmp)
Update testing case with imagedir variable
