update pshell explorer and data import, misc. improvements

FEATURES

- pshell: convert scienta data to true counts
- pre-process: add gauss2_reduction data reduction function
- anglescan: add set_contrast and normalize_strip_phi functions
- explorer: show info about multi-region scans
- documentation: add detailed instructions for angle-scan processing

BUGFIXES

- explorer: fix attributes notebook
- pshell: fix progress bar
- elog: increase the number of accepted attachments

pearl/pearl-data-explorer.ipf

@@ -308,31 +308,44 @@ static function /wave preview_pshell_file(filename)
 	string filename
 
 	dfref saveDF = GetDataFolderDFR()
+
 	setdatafolder $package_path
+	dfref previewDF = GetDataFolderDFR()
 	svar s_preview_file
 	svar s_preview_source
-	psh5_load_preview("preview_image", "pearl_explorer_filepath", filename)
-	s_preview_file = filename
-	s_preview_source = ""
-	wave /z preview_image
-	
 	svar /z s_file_info
 	if (! svar_exists(s_file_info))
 		string /g s_file_info
 	endif
+	
+	dfref tempDF = NewFreeDataFolder()
+	setdatafolder tempDF
+	string dataname
+	dataname = psh5_load_preview("pearl_explorer_filepath", filename)
+	
+	s_preview_file = filename
+	s_preview_source = ""
+
+	wave /z data = $dataname
+	if (waveexists(data))
+		duplicate /o data, previewDF:preview_image
+	else
+		print "no data found in file " + filename
+	endif
+	
 	if (strlen(s_preview_file) > 0)
 		s_file_info = psh5_load_info("pearl_explorer_filepath", filename)
 	else
 		s_file_info = ""
 	endif
 	
-	if (DataFolderExists("attr"))
-		setdatafolder attr
-		preview_attributes(GetDataFolderDFR())
-		setdatafolder ::
+	dfref attrDF = tempDF:attr
+	if (DataFolderRefStatus(attrDF))
+		preview_attributes(attrDF)
 	endif
 	
 	setdatafolder saveDF
+	wave /z /sdfr=previewDF preview_image
 	return preview_image
 end
 
@@ -654,7 +667,6 @@ static function preview_attributes(attr_folder, [dest_folder, attr_filter, inclu
 	attr_names = ""
 	attr_values = ""
 	
-	string /g s_attr_folder = GetDataFolder(1, attr_folder)
 	setdatafolder attr_folder
 	wave /t /z IN
 	wave /t /z ID