user manual: additional updates and new images

These changes complete (I hope) the updates to the user manual to reflect
the use of media including video. Nine images are replaced.
Some more updates in the user-manual.txt to reflect on video files
and not only photographs.

Signed-off-by: willemferguson <willemferguson@zoology.up.ac.za>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

Documentation/user-manual.txt

@@ -152,7 +152,7 @@ temperatures and SAC; total time and number of dives selected).
 
 image::images/main_window_f22.jpg["The Main Window",align="center"]
 
-The user decides which of the four panels are displayed by selecting the
+Decide which of the four panels are displayed by selecting the
 *View* option on the main menu. This feature has several choices of display:
 
 *All*: show all four of the panels as in the screenshot above.
@@ -1579,7 +1579,7 @@ image::images/icons/ShowPhotos_f20.png["FIGURE:Show photos toolbar button",align
 
 This results in a profile display as in the image below:
 
-image::images/LoadImage4.jpg["FIGURE: Photos on dive profile",align="center"]
+image::images/LoadImage4.jpg["FIGURE: Media on dive profile",align="center"]
 
 Hover the mouse over any of the media stubs. A thumbnail image
 is shown of the appropriate media. See the image below:
@@ -2285,11 +2285,11 @@ two red dots.
 [NOTE]
 Photographs and videos that have been added to a dive can be shown on the profile
 by selecting
-the *Show-media* button. The position of a photo on the profile
-shows the exact time when this photo was taken.
+the *Show-media* button. The position of a photo or video on the profile
+shows the exact time when it was taken.
 The runtime of videos is represented by a bar if _Subsurface_ was able to
 extract this information from the video file.
-If this button is not active, the photos are hidden.
+If this button is not active, the media are hidden.
 
 
 The profile can also include the dive computer reported *ceiling* (more
@@ -2932,7 +2932,7 @@ family members/friends. There are two approaches for doing this.
   the appropriate dive log by selecting, from the *Main Menu*, _File -> Open logbook_ and then select your own
   dive log file from the list of files lower down in the menu. However, a problem arises if the users
   prefer different settings for _Subsurface_. For instance, one diver may prefer to see the dive ceiling in the
-  *Profile Panel* and photos icons in the *Dive List*, while the other may not have these preferences. In addition,
+  *Profile Panel* and media icons in the *Dive List*, while the other may not have these preferences. In addition,
   the cloud connection is normally unique for each _Subsurface_ installation and if more than one user wishes to save
   dive data on the cloud, it is inconvenient to open the *Preferences* and change the user-ID data every time
   the cloud is accessed. To solve these problems, launch _Subsurface_ with a _--user=<user name>_ command-line option.
@@ -3918,7 +3918,7 @@ dealing with the appropriate operations.
   the selected dives in the logbook) to one of several formats.
 - <<S_PrintDivelog,_Print_>> -  Print the currently open logbook.
 - <<S_Preferences,_Preferences_>> -  Set the _Subsurface_ preferences.
-- <<S_FindMovedImages, _Find moved images_>> - If photos/videos taken during dives have been moved to
+- <<S_FindMovedImages, _Find moved media_>> - If photos/videos taken during dives have been moved to
       a different disk or directory, locate them and link them to the appropriate dives.
 - <<S_Configure,_Configure dive computer_>> - Edit the configuration of a dive computer.
 - _Quit_ - Quit _Subsurface_.