updates: pshell import, angle-scans, elog

- pshell import: fix units and data scaling.
- pshell import: support new multi-region scans.
- angle scans: add trim function.
- angle scans: update import_tpi_scan function.
- angle scans: fix scales of check waves in normalization.
- area display: new cursor mode for background selection.
- elog: bugfixes (attachment list, check existing logbook).

pearl/pearl-area-import.ipf

@@ -1667,12 +1667,12 @@ function adh5_scale_scienta(data)
 			case 1: // Angular45
 				ALow = -45/2
 				AHigh = +45/2
-				AUnit = "deg"
+				AUnit = "°"
 				break
 			case 2: // Angular60
 				ALow = -60/2
 				AHigh = +60/2
-				AUnit = "deg"
+				AUnit = "°"
 				break
 		endswitch
 	endif