0025803: Defective tests contaminating current directory

Test cases save results in directory pointed by ${imagedir} Tcl variable. File names are initialized in scripts and passed to DRAW command as argument.
Tests User Guide was updated.

Remarks were corrected

tests/bugs/fclasses/bug24931

@@ -8,7 +8,10 @@ puts ""
 
 pload QAcommands
 
-set info [OCC24931]
+set FilePath ${imagedir}/bug24931_testdocument.xml
+
+file delete -force ${FilePath}
+set info [OCC24931 ${FilePath}]
 
 if { [regexp "OK" $info] != 1 } {
   puts "Error: Stack is overflow"

tests/bugs/vis/bug2883_2

@@ -6,6 +6,12 @@ puts ""
 # It is impossible to set material, color and transparency to compound
 ########################################################################
 
+set FilePath_v1 ${imagedir}/bug2883_2_v1.png
+set FilePath_v2 ${imagedir}/bug2883_2_v2.png
+
+file delete -force ${FilePath_v1}
+file delete -force ${FilePath_v2}
+
 box b1 0 0 0 1 2 3
 box b2 4 0 0 3 1 2
 vinit drv1/v1/v1
@@ -18,10 +24,10 @@ vdisplay b1 b2
 vfit
 vsetcolor b1 RED
 vactivate drv1/v1/v1
-vdump v1.png
+vdump ${FilePath_v1}
 vactivate drv1/v2/v1
-vdump v2.png
-set info [diffimage v1.png v2.png 0 0 0]
+vdump ${FilePath_v2}
+set info [diffimage ${FilePath_v1} ${FilePath_v2} 0 0 0]
 if { $info != 0 } {
   puts "Error: images v1 and v2 are different"
 } else {

tests/bugs/xde/bug23951

@@ -8,7 +8,10 @@ puts ""
 
 pload QAcommands
 
-set info [OCC23951]
+set FilePath ${imagedir}/bug23951_test_box.step
+
+file delete -force ${FilePath}
+set info [OCC23951 ${FilePath}]
 
 if { [regexp "Write  Done" $info] != 1 } {
   puts "Error: file was not written"
@@ -16,7 +19,7 @@ if { [regexp "Write  Done" $info] != 1 } {
   puts "OK: file was written"
 }
 
-stepread test_box.step a *
+stepread ${FilePath} a *
 axo
 fit