[Cin] New March 31 AppImages

[Phyllis Smith]

So that the Blend Algebra and Blend Program icons would be visible, I
updated the AppImages.  A few fixes are in too as noted (hopefully
technically correct) in the Release Notes shown last here.

Plus, I did put Andrea's experimental/testing of Gimp-like overlay
algorithms for Addition, Subtraction, Divide, and Multiply using the Blend
Algebra plugin at: https:/
cinelerra-gg.org/download/testing/BlendPluginExamples/gimp_.zip   .
Removed GIT manual reference to Overlays but a little late.

*GIT for Cinelerra-GG has the following changes from 03/01/2025-03/31/2025*
*Blend Algebra and Blend Program* modifications include the following:
  - Icons for Cinfinity and Cinfinity2 have been created by *IgorB*.
  - Code changes by the author, *Georgy*, to both plugins:
   1) Buttons =>project, userlib, syslib will also display the target dir
when the function name is blank.
   2) Refresh will now immediately recompile that function (if any) which
is under the
      timeline cursor when source is newer than shared object. This does
not affect the other
      functions which are not under the cursor and they will still be
recompiled on first access.
   3) Added “output track” of Blend Algebra which was missing in
copy/interpolate functions.
   4) Improved robustness of code to prevent race conditions between
threads of different windows
      when closing or resizing dialog menus.
  *Screencapture* for NetBSD failure has been fixed by adding fallback in
case shm capture does not
work by *Andrew-R*. This fix may be applicable to other Operating Systems.
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